2002A&A...394..137F


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.19CEST01:31:15

2002A&A...394..137F - Astronomy and Astrophysics, volume 394, 137-149 (2002/10-4)

Variability and pulsations in the Be star 66 Ophiuchi.

FLOQUET M., NEINER C., JANOT-PACHECO E., HUBERT A.M., JANKOV S., ZOREC J., BRIOT D., CHAUVILLE J., LEISTER N.V., PERCY J.R., BALLEREAU D. and BAKOS A.G.

Abstract (from CDS):

66 Oph is a Be star seen under a moderate inclination angle that shows strong variability from UV to IR wavelengths. A concise review of long-term variability history is given. High resolution, high S/N spectroscopic observations obtained in 1997, 1998 and 2001 and spectropolarimetric observations obtained in 2000 are presented. These observations occurred during a long-term decrease of Hα intensity. Fundamental parameters of the star have been revisited from Barbier-Chalonge-Divan (BCD) calibrations. New V sin i values are obtained using Fourier transforms applied to observed helium lines and a rotational frequency frot=1.29c/d is determined. Time series analysis and Fourier Doppler Imaging (FDI) of HeI lines (4713, 4921, 5876 and 6678 Å) lead for the first time to the detection of multi-periodicity in 66 Oph. The two main frequencies found are f=2.22c/d and f=4.05c/d . They are attributed to non-radial pulsations and can be associated with mode degree l=2 and l=3, respectively. Inspection of Stokes V profiles suggests the presence of a weak Zeeman signature but further observations are needed to confirm the detection of a magnetic field in 66 Oph.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: activity - stars: individual: 66 Oph - stars: oscillations - stars: magnetic field

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 * gam Cas Be* 00 56 42.5317 +60 43 00.265 1.18 2.29 2.39 2.32 2.40 B0.5IVpe 1151 2
2 * c Per Be* 04 08 39.6921578 +47 42 45.042937 3.45 4.00 4.03 3.91 3.93 B3Ve 369 0
3 * ome Ori Be* 05 39 11.1463172 +04 07 17.279475 3.73 4.48 4.59 4.57 4.67 B3Ve 392 1
4 HD 58050 Be* 07 24 27.6487089696 +15 31 01.916787310 5.39 6.23 6.41     B2Ve 122 0
5 HD 76534 Be* 08 55 08.70673 -43 27 59.8852 7.04 7.62 7.50 8.94   B2Vn 114 0
6 * mu. Cen Be* 13 49 36.9886294 -42 28 25.429594 2.37 3.27 3.43 3.41 3.50 B2Vnpe 416 0
7 * eta Cen Be* 14 35 30.4241610 -42 09 28.170782 1.30 2.12 2.31 2.41 2.59 B2Ve 326 0
8 * 48 Lib Be* 15 58 11.3686950 -14 16 45.689426 4.61 4.77 4.87 4.91 4.96 B5IIIp_sh 429 0
9 * zet Oph Be* 16 37 09.5390545 -10 34 01.529471 1.73 2.58 2.56 2.46 2.50 O9.2IVnn 1751 2
10 * 66 Oph Be* 18 00 15.7982457 +04 22 07.016285 3.77 4.58 4.60 4.47 4.49 B2Ve 329 0
11 * b02 Cyg Be* 20 09 25.6190867940 +36 50 22.596147551 4.03 4.80 4.93     B2.5Ve 249 0

    Equat.    Gal    SGal    Ecl

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2021.04.19-01:31:15

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