2011A&A...536A..82D


C.D.S. - SIMBAD4 rel 1.7 - 2019.10.21CEST06:15:52

2011A&A...536A..82D - Astronomy and Astrophysics, volume 536A, 82-82 (2011/12-1)

CoRoT's view on variable B8/9 stars: spots versus pulsations. Evidence for differential rotation in HD 174648.

DEGROOTE P., ACKE B., SAMADI R., AERTS C., KURTZ D.W., NOELS A., MIGLIO A., MONTALBAN J., BLOEMEN S., BAGLIN A., BAUDIN F., CATALA C., MICHEL E. and AUVERGNE M.

Abstract (from CDS):

There exist few variability studies of stars in the region in the Hertzsprung-Russell diagram between the A and B-star pulsational instability strips. With the aid of the high precision continuous measurements of the CoRoT space satellite, low amplitudes are more easily detected, making a study of this neglected region worthwhile. We collected a small sample of B stars observed by CoRoT to determine the origin of the different types of variability observed. We combine literature photometry and spectroscopy to measure the fundamental parameters of the stars in the sample, and compare asteroseismic modelling of the light curves with (differentially rotating) spotted star models. We found strong evidence for the existence of spots and differential rotation in HD174648, and formulated hypotheses for their origin. We show that the distinction between pulsations and rotational modulation is difficult to make solely based on the light curve, especially in slowly rotating stars.

Abstract Copyright:

Journal keyword(s): stars: activity - stars: early-type - stars: atmospheres - asteroseismology - stars: rotation - stars: individual: HD 174648

Simbad objects: 10

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Number of rows : 10

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2019
#notes
1 HD 46179 ** 06 32 07.1392982683 +06 02 08.289835111   6.659 6.706     B9V 31 0
2 HD 49677 * 06 49 53.5017031191 +08 38 44.023187007   8.12 8.07     B9 5 0
3 HD 60555 * 07 33 52.3644559775 -28 34 03.709820970   7.06 6.76     A5/7V+(F) 22 0
4 HD 121190 Pu* 13 55 12.1418794262 -52 09 38.953997739 5.33 5.63 5.71     B9V 64 0
5 * kap Sco bC* 17 42 29.27520 -39 01 47.9391 1.32 2.211 2.386     B1.5III 227 0
6 HD 170935 * 18 31 43.0537122210 +07 13 54.294983935   7.53 7.38     B8 7 0
7 HD 174648 * 18 51 41.0001981972 -01 45 35.240841550   8.90 8.81     B9.5V 13 0
8 * d Aql * 19 20 35.6861889272 -00 53 31.783617753 5.22 5.408 5.451     B9III 47 0
9 HD 182198 * 19 23 31.6234958461 -00 32 26.092830977   8.10 7.94     B9III 14 0
10 * bet Cep bC* 21 28 39.5968513 +70 33 38.574681 2.05 3.01 3.23 3.33 3.55 B0.5IIIs 677 0

    Equat.    Gal    SGal    Ecl

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2019.10.21-06:15:52

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