2009A&A...495..195P


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.08CET03:35:13

2009A&A...495..195P - Astronomy and Astrophysics, volume 495, 195-199 (2009/2-3)

Hα spectropolarimetry of RY Tauri and PX Vulpeculae.

PEREYRA A., MAGALHAES A.M. and DE ARAUJO F.X.

Abstract (from CDS):

To detect line effects using spectropolarimetry in order to find evidence of rotating disks and their respective symmetry axes in T Tauri stars. We used the IAGPOL imaging polarimeter along with the Eucalyptus-IFU to obtain spectropolarimetric measurements of the T Tauri stars RY Tau (two epochs) and PX Vul (one epoch). Evidence of line effects showing a loop in the Q-U diagram favors a compact rather than an extended source for the line photons in a rotating disk. In addition, the polarization position angle (PA) obtained using the line effect can constrain the symmetry axis of the disk. RY Tau shows a variable Hα double peak in 2004-2005 data. A polarization line effect is evident in the Q-U diagram for both epochs confirming a clockwise rotating disk. A single loop is evident in 2004 changing to a linear excursion plus a loop in 2005. Interestingly, the intrinsic PA calculated using the line effect is consistent between our two epochs (∼167°). An alternative intrinsic PA computed from the interstellar polarization-corrected continuum and averaged between 2001-2005 yielded a PA∼137°. This last value is closer to perpendicular to the observed disk direction (∼25°), as expected from single scattering in an optically thin disk. For PX Vul, we detected spectral variability in Hα along with non-variable continuum polarization when compared with previous data. The Q-U diagram shows a well-defined loop in Hα associated with a counter-clockwise rotating disk. The symmetry axis inferred from the line effect has a PA∼91° (with an ambiguity of 90°). Our results confirm previous evidence that the emission line in T Tauri stars has its origin in a compact source scattered off a rotating accretion disk.

Abstract Copyright:

Journal keyword(s): polarization - stars: individual: RY Tau - stars: individual: PX Vul - stars: circumstellar matter

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * 107 Psc PM* 01 42 29.7634932653 +20 16 06.660242064 6.57 6.08 5.24 4.55 4.12 K1V 494 0
2 V* RY Tau TT* 04 21 57.4132838427 +28 26 35.533990877 10.82 10.34 9.30 9.67 8.87 K1IV/Ve 635 1
3 * omi Sco V* 16 20 38.1806792 -24 10 09.549111 5.99 5.40 4.57 3.69 2.93 A4II/III 238 0
4 LDN 778 DNe 19 26 32.5 +23 58 42           ~ 50 1
5 V* PX Vul Or* 19 26 40.2533631097 +23 53 50.777553057 12.56 12.57 11.83 10.90 10.30 F3Ve 48 0
6 * eta Aql cC* 19 52 28.3677478 +01 00 20.369619 5.12 4.61 3.80   3.030 F6Iab+B9.8V 628 0
7 Ass Vul R 2 As* ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2019.12.08-03:35:13

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