Astronomy and Astrophysics – Astronomy
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006an....327..328s&link_type=abstract
Astronomische Nachrichten, Vol.327, Issue 4, p.328
Astronomy and Astrophysics
Astronomy
6
Stars: Pre-Main Sequence, T Tauri Stars, Stars: Individual (V 1184 Tau)
Scientific paper
We present recent results from optical photometric and spectroscopic observations of the pre-main sequence star V 1184 Tau (CB 34V). The star is associated with the Bok globule CB 34 and was considered as a FUOR candidate in previous studies. Our photometric data obtained from October 2000 to April 2003 show that the stellar brightness varies with an amplitude of about 0.5m (I), but from August 2003 the photometric behavior of the star has changed dramatically. Three deep brightness minima (Δ I ˜4.2m) were observed during the past two years. The analysis of available photometric data suggests that V 1184 Tau shows two types of variability produced (1) by rotation of large cool spotted surface and (2) by occultation from circumstellar clouds of dust or from features of a circumstellar disk. The behavior of the V-I index indicates that the star becomes redder towards minimum light, but from a certain turning point (V ˜18.2m) it gets bluer and is fading further. Five medium dispersion optical spectra of V 1184 Tau were obtained in the period 2001-2004. Significant changes in the profile and strength of the emission lines in the spectrum of V 1184 Tau were found. During minimum light the equivalent width of the Hα emission line increases from 4 Å to 9 Å. The [O I] lines (λλ 6003, 6363 Å) are also seen in emission while the sodium doublet keeps its absorption strength and equivalent width. The possibility to reconstruct the historical light curve of V 1184 Tau using photographical plate archives is briefly discussed.
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