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Post Info TOPIC: Herbig-Haro 30


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RE: Herbig-Haro 30
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The Nature of the Driving Source of the HH30 Jet/Counterjet System

The Herbig-Haro object 30 (HH30) is located in the L1551 dark cloud, at a distance of about 140 parsec, in the Taurus star-forming region. HH30 is considered a prototypical jet-disk system driven by a young stellar object (YSO). The impressive jet/counterjet structure extends several arcminutes in both directions from the exciting source, and shows an undulating morphology in the narrow-band [SII] images. The driving source of HH30 remains optically invisible, highly extinguished by an edge-on disk, which extends up to a radius of about 250 AU perpendiculary to the jet, as shown in the HST images.
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Title: The Photometric Variability of HH 30
Authors: Alan M. Watson, María Carolina Durán-Rojas, Karl R. Stapelfeldt

HH 30 is an edge-on disk around a young stellar object. Previous imaging with the Hubble Space Telescope has show morphological variability that is possibly related to the rotation of the star or the disk. We report the results of two terrestrial observing campaigns to monitor the integrated magnitude of HH 30. We use the Lomb-Scargle periodogram to look for periodic modulation with periods between 2 days and almost 90 days in these two data sets and in a third, previously published, data set. We develop a method to deal with short-term correlations in the data. Our results indicate that none of the data sets shows evidence for significant periodic photometric modulation.

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