2010A&A...516A..80N


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.02CEST23:59:40

2010A&A...516A..80N - Astronomy and Astrophysics, volume 516, A80-80 (2010/6-3)

Properties and nature of Be stars. 27. Orbital and recent long-term variations of the Pleiades Be star Pleione = BU Tauri.

NEMRAVOVA J., HARMANEC P., KUBAT J., KOUBSKY P., ILIEV L., YANG S., RIBEIRO J., SLECHTA M., KOTKOVA L., WOLF M. and SKODA P.

Abstract (from CDS):

Radial-velocity variations of the Hα emission measured on the steep wings of the Hα line, prewhitened for the long-time changes, vary periodically with a period of 218.025d±0.022d, confirming the suspected binary nature of the bright Be star BU Tau, a member of the Pleiades cluster. The orbit seems to have a high eccentricity over 0.7, but we also briefly discuss the possibility that the true orbit is circular and that the eccentricity is spurious owing to the phase-dependent effects of the circumstellar matter. The projected angular separation of the spectroscopic orbit is large enough to allow the detection of the binary with large optical interferometers, provided the magnitude difference primary - secondary is not too large. Since our data cover the onset of a new shell phase up to development of a metallic shell spectrum, we also briefly discuss the recent long-term changes. We confirm the formation of a new envelope, coexisting with the previous one, at the onset of the new shell phase. We find that the full width at half maximum of the Hα profile has been decreasing with time for both envelopes. In this connection, we briefly discuss Hirata's hypothesis of precessing gaseous disk and possible alternative scenarios of the observed long-term changes.

Abstract Copyright:

Journal keyword(s): stars: early-type - binaries: close - stars: emission-line, Be - stars: individual: BU Tau

Simbad objects: 3

goto Full paper

goto View the reference in ADS

Number of rows : 3

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 Cl Melotte 22 OpC 03 47 00 +24 07.0           ~ 2978 0
2 * 27 Tau SB* 03 49 09.7425852 +24 03 12.300277 3.18 3.54 3.63 3.62 3.68 B8III 361 0
3 * 28 Tau Be* 03 49 11.2175463444 +24 08 12.172181348 4.73 5.01 5.09   5.08 B8Vne 434 0

    Equat.    Gal    SGal    Ecl

To bookmark this query, right click on this link: simbad:objects in 2010A&A...516A..80N and select 'bookmark this link' or equivalent in the popup menu


2020.07.02-23:59:40

© Université de Strasbourg/CNRS

    • Contact