* Astronomy

TX Piscium (19 Psc) is a variable carbon star in the constellation Pisces. It is amongst the reddest stars known, with a lovely reddish hue when seen in binoculars. Read more Position(2000): RA 23 46 23.5165, Dec +03 29 12.519

Title: Discovery of a new cataclysmic variable through optical variability and X-ray emission Authors: Magaretha L. Pretorius, Christian Knigge Aims: We present discovery observations of the new cataclysmic variable star (CV) 1RXS J092737.4-191529, as well a...

The symbiotic variable star Z Andromedae is in outburst. The star is currently at magnitude 9.0 The cataclysmic variable star is a prototype for symbiotic variables (ZANDs). The system consists of a primary white dwarf and a secondary M giant star. Apparent magnitude: (V) 10.53 Max magnitude...

The cataclysmic variable star BZ Ursae Majoris appears to be in outburst. It was discovered by Keith Graham on June 22nd at mag 11.5. Outbursts are short and usually last only 3-4 days. The The "dwarf nova" BZ UMa is located in Ursa Major, an...

Variable Star Magnitude: 4.79 Spectral type: M2III Distance: 250 - 500 light years away New catalogue of Suspected Variable stars (NSV) 99 Position (2000): RA 00 14 36.1645, Dec +20 12 24.126

Outburst of Blue Variable (LBV) R71 (= HDE 269006, ASAS 050207-7120.2, V733 LMC), in the Large Magellanic Cloud (LMC). OUTBURST OF R71 IN THE LARGE MAGELLANIC CLOUD R. Gamen, Instituto de Astrofisica de La Plata, CONICET; R. Barba, Universidad de La Serena and Insituto de Ciencias Astronomicas y d...

Carbon stars poster. Download HERE. (1282 X 1657 .JPG)

The WZ Sge-type dwarf nova EG Cancri is in outburst. The last outburst occurred in November 1996, and the outburst before that, was in November 1977. The cataclysmic variable was first discovered by M. Huruhata in 1983. The 1977 outburst reached a maximum brightness of 11.9. The nova has long inter...

A new star appeared in the constellation of Orion in late 2003 when the young pre-main sequence star V1647 Orionis went into outburst. The eruption and huge increase in brightness of the object resulted in the appearance of a reflection nebula called McNeils Nebula, named after the amateur astrono...

Title: AGB Variables and the Mira Period-Luminosity Relation Authors: Patricia A. Whitelock, Michael W. Feast, Floor van Leeuwen Published data for large amplitude asymptotic giant branch variables in the Large Magellanic Cloud are re-analysed to establish the constants for an infrared (K) p...

Title: X-ray Spectral Variations of U Gem from Quiescence to Outburst Authors: T. Guver, C. Uluyazi, M.T. Ozkan, E. Gogus In this paper researchers report the discovery of a high energy component of the X-ray spectra of U Geminorum, which can be observed while the source is in...

What's the farthest visible naked-eye star? The semi-regular pulsating star V762 Cas (HIP 5926, HD 7389) in Cassiopeia at a distance of 15000 LY is probably the furthest visible naked-eye star. [url=http://www.adrive.com/public/5df2bebfcdf76db969b97feba80757078d79314f47b20ce633e2...

Title: The dynamical stability of W Ursae Majoris-type systems Authors: Lifang Li, Fenghui Zhang Theoretical study indicates that a contact binary system would merge into a rapidly rotating single star due to tidal instability when the spin angular momentum of the system is more than a third of it...

Title: The symbiotic star CH Cygni. I. An analysis of the shocked nebulae at different epochs Authors: M. Contini (1,2), R. Angeloni (1,2), P. Rafanelli (1) ((1) Dipartimento di Astronomia, University of Padova, Italy; (2) School of Physics and Astronomy, Tel-Aviv University, Israel) Context....

WZ Sagittae is an unusual SU UMa star Period of about 4400 days (?). Magnitude range: 10.1 v - 19 V WZ Sagittae.kmz Position (2000): RA 20h 07m 36.53s, Dec +17° 42' 15.3" The discovery of a large disc of dust around a binary star system could force astronomers to rethink their computer models of the...

Title: Searching for Variables in One of the WHAT Fields Authors: Avi Shporer (1), Tsevi Mazeh (1), Amit Moran (1), Gaspar Bakos (2), Geza Kovacs (3) ((1) Wise Observatory, TAU (2) CfA (3) Konkoly Observatory) We present preliminary results on a single field observed by WHAT...

Title: Spitzer Observations of Var Her 04: Possible Detection of Dust Formation in a Super-Outbursting TOAD Authors: David R. Ciardi, Stefanie Wachter, D. W. Hoard, Steve B. Howell, Gerard T. van Belle Researchers present four MIPS (24 µm) and two IRAC (3.6, 4.5, 5.8, and 8....

Chi Cygni is a giant-star Mira variable that can reach magnitude 3.5 for some time during a 408.05-day variation period, from magnitude 13.4. Chi Cygni is a rare class S (S6) star, highly enriched in zirconium, that is about 345 light year...

Astronomers using the W. M. Keck Observatory have peered far into a young planetary system, giving an unprecedented view of dust and gas that might eventually form worlds similar to Jupiter, Venus or even Earth. "Because the gas, dust and debris that orbit young stars provide the raw material...

Title: A deep mosaic of (O III) 5007 A CCD images of the environment of the LBV star P Cygni Authors: P. Boumis (1), J. Meaburn (1,2), M. P. Redman (3), F. Mavromatakis (4) ((1) Institute of Astronomy & Astrophysics, National Observatory of Athens, Greece, (2) Jodrell Bank Obse...

IRC +10216 or CW Leonis is the best studied carbon star, but also a very peculiar one with the central star being embedded in a thick dust envelope. Therefore, its energy is emitted mostly at infrared wavelengths: in fact, IRC +10216 is the brightest object in the sky at a wavelength of 10 m. Recent spec...

IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. At a distance of about 150 light years from the Solar System, it is just luminous enough to be seen with the unaided eye. The primary (IK Pegasi A) is a main sequence, A-class star that displays minor pulsations in luminosity. I...

On the 17th October, 2008, the Swift satellite detected increased activity in the 15-50 keV band for the transient pulsar and High Mass X-ray Binary V0332+53. The Be/neutron star system contains the variable BQ Cam, which the optical counterpart of the X-ray binary source V0332+53. Spin Period: ...

Title: SDSS J123813.73-033933.0, a cataclysmic variable evolved beyond the period minimum Authors: A. Aviles, S. Zharikov, G. Tovmassian, R. Michel, M. Tapia, M. Roth, V. Neustroev, C. Zurita, M. Andreev, A. Sergeev, E. Pavlenko, V. Tsymbal, G.C. Anupama, U.S. Kamath, D.K. Sahu We present infr...

W Ursae Majoris (W UMa) is a variable star in the constellation Ursa Major. It is an eclipsing contact binary whose two component stars share a common outer layer, and is the prototype of a class of contact binary variables known as W Ursae Majoris variables. [url=http://en.wikipedia.org/wiki/W_...

Title: The Exciting Star of the Berkeley 59/Cepheus OB4 Complex and Other Chance Variable Star Discoveries Authors: Daniel J. Majaess, David G. Turner, David J. Lane, Kathleen E. Moncrieff A study is presented regarding the nature of several variable stars sampled during a campaign of photometr...

Title: The Blazhko Effect in Delta Scuti and other Groups of Pulsating Stars Authors: Michel Breger Amplitude and period variations have been detected in almost all types of pulsating stars. Many of these modulations are nearly periodic. In RR Lyrae stars the phenomenon in known as the Blazhko Eff...

Title: Carbon-rich RR Lyr type stars Authors: George Wallerstein, V. V. Kovtyukh, S. M. Andrievsky We have derived CNO abundances in 12 RR Lyrae stars. Four stars show [C/Fe] near 0.0 and two stars show [C/Fe] = 0.52 and 0.65. Red giant branch stars, which are known to be the predecessors of RR Lyrae st...

Title: Late-Type Near-Contact Eclipsing Binary [HH97] FS Aur-79 Authors: S. J. Austin, J. W. Robertson, C. Tycner, T. Campbell, R. K. Honeycutt The secondary photometric standard star #79 for the FS Aur field (Henden & Honeycutt 1997) designated as [HH97] FS Aur-79 (GSC 1874 399) is a short pe...

	Forum	Replies	Views	Last Post
Variable Star TX Piscium (Preview)	Stars/galaxy News	2	1911	Jan 4 16:39 2013 by Blobrana
TX Piscium (19 Psc) is a variable carbon star in the constellation Pisces. It is amongst the reddest stars known, with a lovely reddish hue when seen in binoculars. Read more Position(2000): RA 23 46 23.5165, Dec +03 29 12.519
Nova Variable Cataclysmic variable ( 1 2 ) (Preview)	Stars/galaxy News	16	7603	Dec 7 07:58 2011 by Blobrana
Title: Discovery of a new cataclysmic variable through optical variability and X-ray emission Authors: Magaretha L. Pretorius, Christian Knigge Aims: We present discovery observations of the new cataclysmic variable star (CV) 1RXS J092737.4-191529, as well a...
Variable Z Andromedae (Preview)	Stars/galaxy News	5	2376	Oct 23 01:54 2012 by Blobrana
The symbiotic variable star Z Andromedae is in outburst. The star is currently at magnitude 9.0 The cataclysmic variable star is a prototype for symbiotic variables (ZANDs). The system consists of a primary white dwarf and a secondary M giant star. Apparent magnitude: (V) 10.53 Max magnitude...
Variable BZ Ursae Majoris (Preview)	Events	1	1423	Sep 24 15:53 2009 by Blobrana
The cataclysmic variable star BZ Ursae Majoris appears to be in outburst. It was discovered by Keith Graham on June 22nd at mag 11.5. Outbursts are short and usually last only 3-4 days. The The "dwarf nova" BZ UMa is located in Ursa Major, an...
Variable chi Pegasus (Preview)	Stars/galaxy News	0	1176	Oct 2 19:06 2009 by Blobrana
Variable Star Magnitude: 4.79 Spectral type: M2III Distance: 250 - 500 light years away New catalogue of Suspected Variable stars (NSV) 99 Position (2000): RA 00 14 36.1645, Dec +20 12 24.126
LBV Variable LBV R71 (Preview)	Stars/galaxy News	2	1757	Aug 5 14:38 2012 by Blobrana
Outburst of Blue Variable (LBV) R71 (= HDE 269006, ASAS 050207-7120.2, V733 LMC), in the Large Magellanic Cloud (LMC). OUTBURST OF R71 IN THE LARGE MAGELLANIC CLOUD R. Gamen, Instituto de Astrofisica de La Plata, CONICET; R. Barba, Universidad de La Serena and Insituto de Ciencias Astronomicas y d...
Stars Variable Carbon Carbon stars (Preview)	Stars/galaxy News	4	2295	Jan 22 00:45 2013 by Blobrana
Carbon stars poster. Download HERE. (1282 X 1657 .JPG)
Variable EG Cancri (Preview)	Astronomy News	0	1127	Oct 12 16:32 2009 by Blobrana
The WZ Sge-type dwarf nova EG Cancri is in outburst. The last outburst occurred in November 1996, and the outburst before that, was in November 1977. The cataclysmic variable was first discovered by M. Huruhata in 1983. The 1977 outburst reached a maximum brightness of 11.9. The nova has long inter...
Variable Orion V1647 Orionis (Preview)	Stars/galaxy News	7	2534	Feb 7 02:50 2013 by Blobrana
A new star appeared in the constellation of Orion in late 2003 when the young pre-main sequence star V1647 Orionis went into outburst. The eruption and huge increase in brightness of the object resulted in the appearance of a reflection nebula called McNeils Nebula, named after the amateur astrono...
Variable Asymptotic giant branch (AGB) variables (Preview)	Stars/galaxy News	6	2928	May 29 20:13 2013 by Blobrana
Title: AGB Variables and the Mira Period-Luminosity Relation Authors: Patricia A. Whitelock, Michael W. Feast, Floor van Leeuwen Published data for large amplitude asymptotic giant branch variables in the Large Magellanic Cloud are re-analysed to establish the constants for an infrared (K) p...
Variable U Geminorum (Preview)	Stars/galaxy News	7	1889	Apr 10 21:08 2012 by Blobrana
Title: X-ray Spectral Variations of U Gem from Quiescence to Outburst Authors: T. Guver, C. Uluyazi, M.T. Ozkan, E. Gogus In this paper researchers report the discovery of a high energy component of the X-ray spectra of U Geminorum, which can be observed while the source is in...
Variable V762 Cassiopeiae (Preview)	Stars/galaxy News	0	5036	Sep 9 16:08 2008 by Blobrana
What's the farthest visible naked-eye star? The semi-regular pulsating star V762 Cas (HIP 5926, HD 7389) in Cassiopeia at a distance of 15000 LY is probably the furthest visible naked-eye star. [url=http://www.adrive.com/public/5df2bebfcdf76db969b97feba80757078d79314f47b20ce633e2...
Variable W UMa W UMa systems (Preview)	Stars/galaxy News	7	4177	Jan 18 16:35 2017 by Blobrana
Title: The dynamical stability of W Ursae Majoris-type systems Authors: Lifang Li, Fenghui Zhang Theoretical study indicates that a contact binary system would merge into a rapidly rotating single star due to tidal instability when the spin angular momentum of the system is more than a third of it...
Variable CH Cygni (Preview)	Stars/galaxy News	8	2545	Mar 4 19:35 2017 by Blobrana
Title: The symbiotic star CH Cygni. I. An analysis of the shocked nebulae at different epochs Authors: M. Contini (1,2), R. Angeloni (1,2), P. Rafanelli (1) ((1) Dipartimento di Astronomia, University of Padova, Italy; (2) School of Physics and Astronomy, Tel-Aviv University, Israel) Context....
Variable WZ Sagittae (Preview)	Stars/galaxy News	2	1535	May 10 11:12 2017 by Blobrana
WZ Sagittae is an unusual SU UMa star Period of about 4400 days (?). Magnitude range: 10.1 v - 19 V WZ Sagittae.kmz Position (2000): RA 20h 07m 36.53s, Dec +17° 42' 15.3" The discovery of a large disc of dust around a binary star system could force astronomers to rethink their computer models of the...
Variable Variables (Preview)	Stars/galaxy News	5	2338	Jul 17 08:53 2012 by Blobrana
Title: Searching for Variables in One of the WHAT Fields Authors: Avi Shporer (1), Tsevi Mazeh (1), Amit Moran (1), Gaspar Bakos (2), Geza Kovacs (3) ((1) Wise Observatory, TAU (2) CfA (3) Konkoly Observatory) We present preliminary results on a single field observed by WHAT...
Variable 1835+25 Var_Her_04 (Preview)	Stars/galaxy News	0	1009	Aug 4 15:36 2006 by Blobrana
Title: Spitzer Observations of Var Her 04: Possible Detection of Dust Formation in a Super-Outbursting TOAD Authors: David R. Ciardi, Stefanie Wachter, D. W. Hoard, Steve B. Howell, Gerard T. van Belle Researchers present four MIPS (24 µm) and two IRAC (3.6, 4.5, 5.8, and 8....
Mira Variable Chi Cygni ( 1 2 ) (Preview)	Stars/galaxy News	10	5488	Oct 16 16:44 2017 by Blobrana
Chi Cygni is a giant-star Mira variable that can reach magnitude 3.5 for some time during a 408.05-day variation period, from magnitude 13.4. Chi Cygni is a rare class S (S6) star, highly enriched in zirconium, that is about 345 light year...
Variable MWC 419 (Preview)	Stars/galaxy News	1	1333	Dec 24 18:17 2009 by Blobrana
Astronomers using the W. M. Keck Observatory have peered far into a young planetary system, giving an unprecedented view of dust and gas that might eventually form worlds similar to Jupiter, Venus or even Earth. "Because the gas, dust and debris that orbit young stars provide the raw material...
Variable P Cygni (Preview)	Stars/galaxy News	4	1875	Aug 17 16:35 2014 by Blobrana
Title: A deep mosaic of (O III) 5007 A CCD images of the environment of the LBV star P Cygni Authors: P. Boumis (1), J. Meaburn (1,2), M. P. Redman (3), F. Mavromatakis (4) ((1) Institute of Astronomy & Astrophysics, National Observatory of Athens, Greece, (2) Jodrell Bank Obse...
Variable Mira CW Leonis (Preview)	Stars/galaxy News	7	3701	Jun 27 10:54 2012 by Blobrana
IRC +10216 or CW Leonis is the best studied carbon star, but also a very peculiar one with the central star being embedded in a thick dust envelope. Therefore, its energy is emitted mostly at infrared wavelengths: in fact, IRC +10216 is the brightest object in the sky at a wavelength of 10 m. Recent spec...
Variable IK Pegasi (Preview)	Stars/galaxy News	0	2452	Jan 8 03:23 2010 by Blobrana
IK Pegasi (or HR 8210) is a binary star system in the constellation Pegasus. At a distance of about 150 light years from the Solar System, it is just luminous enough to be seen with the unaided eye. The primary (IK Pegasi A) is a main sequence, A-class star that displays minor pulsations in luminosity. I...
Variable BQ Camelopardalis (Preview)	Stars/galaxy News	5	2419	Feb 14 17:34 2017 by Blobrana
On the 17th October, 2008, the Swift satellite detected increased activity in the 15-50 keV band for the transient pulsar and High Mass X-ray Binary V0332+53. The Be/neutron star system contains the variable BQ Cam, which the optical counterpart of the X-ray binary source V0332+53. Spin Period: ...
Variable SDSS J123813.73-033933.0 (Preview)	Stars/galaxy News	0	1228	Jan 18 18:26 2010 by Blobrana
Title: SDSS J123813.73-033933.0, a cataclysmic variable evolved beyond the period minimum Authors: A. Aviles, S. Zharikov, G. Tovmassian, R. Michel, M. Tapia, M. Roth, V. Neustroev, C. Zurita, M. Andreev, A. Sergeev, E. Pavlenko, V. Tsymbal, G.C. Anupama, U.S. Kamath, D.K. Sahu We present infr...
Variable W UMa W Ursae Majoris (Preview)	Stars/galaxy News	1	1510	Jan 20 15:07 2010 by Blobrana
W Ursae Majoris (W UMa) is a variable star in the constellation Ursa Major. It is an eclipsing contact binary whose two component stars share a common outer layer, and is the prototype of a class of contact binary variables known as W Ursae Majoris variables. [url=http://en.wikipedia.org/wiki/W_...
Cepheids Variable Variable Stars (Preview)	Stars/galaxy News	8	2826	Dec 23 17:19 2011 by Blobrana
Title: The Exciting Star of the Berkeley 59/Cepheus OB4 Complex and Other Chance Variable Star Discoveries Authors: Daniel J. Majaess, David G. Turner, David J. Lane, Kathleen E. Moncrieff A study is presented regarding the nature of several variable stars sampled during a campaign of photometr...
Variable Delta Scuti (Preview)	Stars/galaxy News	0	1277	Jan 26 19:00 2010 by Blobrana
Title: The Blazhko Effect in Delta Scuti and other Groups of Pulsating Stars Authors: Michel Breger Amplitude and period variations have been detected in almost all types of pulsating stars. Many of these modulations are nearly periodic. In RR Lyrae stars the phenomenon in known as the Blazhko Eff...
RR Lyrae Variable RR Lyrae stars ( 1 2 ) (Preview)	Stars/galaxy News	17	5861	Jul 17 12:41 2014 by Blobrana
Title: Carbon-rich RR Lyr type stars Authors: George Wallerstein, V. V. Kovtyukh, S. M. Andrievsky We have derived CNO abundances in 12 RR Lyrae stars. Four stars show [C/Fe] near 0.0 and two stars show [C/Fe] = 0.52 and 0.65. Red giant branch stars, which are known to be the predecessors of RR Lyrae st...
Variable Eclipsing Binary FS Aur-79 (Preview)	Stars/galaxy News	2	1775	Jan 24 08:46 2011 by Blobrana
Title: Late-Type Near-Contact Eclipsing Binary [HH97] FS Aur-79 Authors: S. J. Austin, J. W. Robertson, C. Tycner, T. Campbell, R. K. Honeycutt The secondary photometric standard star #79 for the FS Aur field (Henden & Honeycutt 1997) designated as [HH97] FS Aur-79 (GSC 1874 399) is a short pe...