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J/A+A/341/553       RY Tau in 1996                (Petrov+ 1999)

Brightening of the T Tauri star RY Tau in 1996. Photometry, polarimetry and high resolution spectroscopy Petrov P.P., Zajtseva G.V., Efimov Yu.S., Duemmler R., Ilyin I.V., Tuominen I., Shcherbakov V.A. <Astron. Astrophys. 341, 553 (1999)> =1999A&A...341..553P
ADC_Keywords: Stars, pre-main sequence ; Photometry, UBVRI ; Polarization Keywords: stars: pre-main sequence - stars: individual: RY Tau - cirsumstellar matter Abstract: The T Tauri star RY Tau has increased its brightness from V=10.6mag to V=9.6mag in October-November 1996. By February-March 1997, the star has faded again to V=10.8mag. High-resolution echelle spectra of RY Tau were obtained wit h the SOFIN spectrograph at the Nordic Optical Telescope (La Palma, Spain) at lo w and high brightness levels of the star. No significant changes in the photosph eric lines, which are sensitive to temperature and gravity, were noticed. The spectral type of RY Tau is defined as G1-2IV, which in combination with photomet ric data implies AV=1.0-1.3mag. Polarimetric patrol of RY Tau during the fadin g of the star showed an increase of its intrinsic polarization from 0.5-1.0% at high brightness to about 2% at low brightness in the V, R and I bands. The flux radiated in Hα and the IR Ca II emission lines remained about the same, in spite of the one magnitude difference in the continuum flux. These results indicate that variable obscuration of the star by circumstellar dust clo uds was responsible for the brightness change of RY Tau, and that the emission l ine source is mostly outside of the obscured region. Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 04 21 57.3 +28 26 37 RY Tau = HD 283571 ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 33 642 UBV-photometry of RY Tau in 1965-1997 table3.dat 66 45 Observed and intrinsic polarization of RY Tau in UBVRI
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 11 F11.3 d JD Julian Date 14- 19 F6.3 mag Vmag V magnitude 22- 26 F5.3 mag B-V ? B-V colour index 29- 33 F5.3 mag U-B ? U-B colour index
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 11 F11.3 d JD Julian Date 14 A1 --- band [UBVRI] photometric band (U,B,V,R,I) 17- 21 F5.2 mag mag Brightness in that band 25- 28 F4.2 % P(obs) Observed polarization in that band 30- 33 F4.2 % e_P(obs) Mean error of the observed polarization 35- 39 F5.1 deg PA(obs) Observed position angle of polarization in that band 41- 43 F3.1 deg e_PA(obs) Mean error of observed position angle 47- 50 F4.2 % P(intr) Intrinsic polarization in that band (after correction for interstellar polarization) (1) 52- 55 F4.2 % e_P(intr) Mean error of intrinsic polarization 57- 61 F5.1 deg PA(intr) Position angle of intrinsic polarization in that band (after correction for interstellar polarization) 63- 66 F4.1 deg e_PA(intr) Mean error of position angle of intrinsic polarization
Note (1): correction for interstellar polarization: P(max)=2.84%, PA=26 deg. (lambda(max)=5500Å) (see text)
Acknowledgements: Rolf Duemmler
(End) [CDS] 28-Oct-1998
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