Optical Variability of the T Tauri Star HH30

Details Optical Variability of the T Tauri Star HH30 Optical Variability of the T Tauri Star HH30

2000-08-18

arxiv.org/abs/astro-ph/0008301v1

2000, ApJ, 542, L21

Astronomy and Astrophysics

Astrophysics

7 pages, 3 figures. Accepted for ApJ Letters

Scientific paper

10.1086/312920

We report results of VRI photometric monitoring of the T Tauri star plus disk system HH30. We find that HH30 is highly variable over timescales of a few days with Delta V~1.5 mag, Delta I~1.1 mag. Furthermore we find hints of periodicity with periodograms indicating possible periods of 11.6 and 19.8 days. The VRI photometry is available through the anonymous ftp service. We model the variability with Monte Carlo radiation transfer simulations for a spotted star plus disk system and find that the large variability is best reproduced with a single hot spot and circumstellar grains that are larger than typical interstellar grains. The apparent existence of a single hot spot and the need for larger, more forward throwing grains is consistent with previous modeling of HST imagery.

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