2007MNRAS.380..741K


C.D.S. - SIMBAD4 rel 1.7 - 2021.04.15CEST07:59:55

2007MNRAS.380..741K - Mon. Not. R. Astron. Soc., 380, 741-748 (2007/September-2)

The detection of the very low amplitude 16.2-min pulsation in individual lines of first ionization stage of rare earth elements in the roAp star βCrB.

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

Abstract (from CDS):

With high precision spectroscopic data obtained with Ultraviolet and Visual Echelle Spectrograph (UVES) on the Very Large Telescope (VLT) we detect radial velocity pulsation with a period of 16.2min and with amplitudes of about 30m/s in individual lines of the first ionization stage of rare earth elements, and in Hα, with typical precision in the range 2-8m/s for a single line, and better than 1m/s for some ensembles of lines. The second ionization stages of rare earth elements show weak or no detectable pulsation, while lines of Fei or Feii show no signal at high precision. An abundance analysis shows the rare earth elements to be overabundant by about 1dex, rather than the 2-3dex often seen in other rapidly oscillating Ap (roAp) stars, and it shows the presence of the ionization disequilibrium for Nd and Pr that is typical of most roAp stars. The pulsational radial velocity curve reaches maximum for the lines of the rare earth elements before it does for Hα which is opposite to the case for most other roAp stars with implications for the stratification level of the rare earth elements. Similarities between βCrB and the longest period roAp star, HD116114, suggest that many more low-amplitude roAp stars await detection, with implications for understanding the pulsation driving mechanism and mode selection mechanism in these stars.

Abstract Copyright: 2007 The Authors. Journal compilation © 2007 RAS

Journal keyword(s): stars: chemically peculiar - stars: individual: HD137909 - 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* AP Scl a2* 01 05 55.7024515557 -26 43 43.987109070   8.60 8.40     A2Vp 105 0
2 * 53 Cam a2* 08 01 42.4313674994 +60 19 27.801603076   6.177 6.008     A3VpSrSiCrEu 385 0
3 HD 83368 a2* 09 36 25.40686 -48 45 04.2549   6.480 6.232     A8VSrCrEu+F9V 259 0
4 HD 99563 a2* 11 27 16.63609 -08 52 08.1942           A9III 73 0
5 V* V816 Cen dS* 11 37 37.0411005456 -46 42 34.875395453 8.99 8.79 8.03     F8/G0p 299 0
6 HD 116114 PM* 13 21 46.3077068552 -18 44 31.541856988   7.34 7.02     F0VpSrCrEu 124 0
7 * bet CrB a2* 15 27 49.7315305 +29 06 20.522375 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 662 0
8 * 33 Lib a2* 15 29 34.7422042672 -17 26 27.375775287 7.22 7.07 6.69     F0VspEuGdSr 240 0
9 * gam Equ a2* 21 10 20.5001160337 +10 07 53.682085548 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 522 0
10 HD 204411 a2* 21 26 51.6210422364 +48 50 06.598904376 5.54 5.38 5.31     A4VpSiCrHg 177 0

    Equat.    Gal    SGal    Ecl

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2021.04.15-07:59:55

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