2005MNRAS.364..864E


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.14CEST12:57:43

2005MNRAS.364..864E - Mon. Not. R. Astron. Soc., 364, 864-872 (2005/December-2)

The discovery of remarkable 5km/s pulsational radial velocity variations in the roAp star HD99563.

ELKIN V.G., KURTZ D.W. and MATHYS G.

Abstract (from CDS):

In a high-resolution spectral survey of nearly half the 34 known rapidly oscillating Ap (roAp) stars, using the Ultraviolet-Visual Echelle Spectrograph on the Very Large Telescope, we have discovered remarkably large amplitude pulsations in the roAp star HD99563 with some spectral lines showing radial velocity amplitudes up to 5km/s (10km/s peak-to-peak) with a pulsation period of 10.7min. As for many other roAp stars, we find the largest pulsation amplitudes for lines of some rare earth elements and in the core of the Hα line. The highest amplitudes of 5km/s are seen in rather weak lines of Euii and Tmii. Stronger lines of Priii and Ndiii have pulsation amplitudes in the range 0.7 to 3.5km/s for different lines. In the narrow Hα core, the average amplitude is 2.6km/s, but, as is the case for other lines, the amplitude and phase vary strongly with line depth (atmospheric height), with the amplitude of the radial velocity variations of the line bisector reaching a maximum of 4.3km/s at the bottom of the core. Some other elements show pulsation amplitudes 0.1 to 0.7km/s. Variations in velocity amplitude and phase for several spectral lines were studied using line-bisector measurements to obtain information about the vertical structure of the pulsation modes and the stellar atmosphere.

Abstract Copyright: 2005 The Authors. Journal compilation © 2005 RAS

Journal keyword(s): stars: individual: HD99563 - stars: magnetic fields - stars: oscillations - stars: variables: other

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 - 2021
#notes
1 V* V409 Car a2* 07 30 56.9889252164 -57 59 28.237596257   9.13 8.89     ApSr(Eu) 116 0
2 HD 83368 a2* 09 36 25.40686 -48 45 04.2549   6.480 6.232     A8VSrCrEu+F9V 259 0
3 HD 99563 a2* 11 27 16.63609 -08 52 08.1942           A9III 73 0
4 V* V816 Cen dS* 11 37 37.0411005456 -46 42 34.875395453 8.99 8.79 8.03     F8/G0p 299 0
5 HD 116114 PM* 13 21 46.3077068552 -18 44 31.541856988   7.34 7.02     F0VpSrCrEu 124 0
6 V* PP Vir a2* 14 04 48.9378026422 +05 24 51.462293664   8.70 8.29     F0 73 0
7 * alf Cir a2* 14 42 30.4195804 -64 58 30.493451 3.55 3.43 3.19 2.96 2.86 A7VpSrCrEu 339 0
8 * 33 Lib a2* 15 29 34.7422042672 -17 26 27.375775287 7.22 7.07 6.69     F0VspEuGdSr 240 0
9 V* V694 CrA a2* 18 12 25.8347315452 -37 45 09.274292137   8.34 7.92     ApSrCrEu 108 0
10 * gam Equ a2* 21 10 20.5001160337 +10 07 53.682085548 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 522 0

    Equat.    Gal    SGal    Ecl

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2021.04.14-12:57:43

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