2001A&A...367..939C


Query : 2001A&A...367..939C

2001A&A...367..939C - Astronomy and Astrophysics, volume 367, 939-942 (2001/3-1)

The core-wing anomaly of cool Ap stars. Abnormal Balmer Profiles.

COWLEY C.R., HUBRIG S., RYABCHIKOVA T.A., MATHYS G., PISKUNOV N. and MITTERMAYER P.

Abstract (from CDS):

The profiles of Hα in a number of cool Ap stars are anomalous. Broad wings, indicative of temperatures in the range 7000-8000K end abruptly in narrow cores. The widths of these cores are compatible with those of dwarfs with temperatures of 6000 K or lower. This profile has been known for Przybylski's star, but it is seen in other cool Ap stars. The Hβ profile in several of these stars shows a similar core-wing anomaly (CWA). In Przybylski's star, the CWA is probably present at higher Balmer members. We are unable to account for these profiles within the context of LTE and normal dwarf atmospheres. We conclude that the atmospheres of these stars are not ``normal''. This is contrary to a notion that has long been held.

Abstract Copyright:

Journal keyword(s): stars: chemically peculiar - stars: chromospheres - stars: oscillations

Simbad objects: 15

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Number of rows : 15
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 HD 965 * 00 14 04.0647520206 -00 02 00.101552192   8.94 8.57     ApSrEuCr 60 0
2 * 63 Tau SB* 04 23 25.0639692398 +16 46 38.158913556   5.957 5.625 7.04 5.33 A1m 275 0
3 * alf CMi SB* 07 39 18.11950 +05 13 29.9552 0.82 0.79 0.37 -0.05 -0.28 F5IV-V+DQZ 1791 0
4 * tau UMa SB* 09 10 55.0404694887 +63 30 49.064336279   5.008 4.640     kA5hF0mF5II 222 1
5 HD 83368 a2* 09 36 25.40686 -48 45 04.2549   6.480 6.232     A8VSrCrEu+F9V 259 0
6 V* V816 Cen dS* 11 37 37.0411005456 -46 42 34.875395453 8.99 8.79 8.03     F8/G0p 300 0
7 * bet Vir PM* 11 50 41.7182390 +01 45 52.991019 4.26 4.15 3.60 3.13 2.85 F9V 871 0
8 * gam Vir B Pe* 12 41 39.5425844770 -01 26 57.847656959   3.85 3.49     F0mF2V 218 0
9 V* PP Vir a2* 14 04 48.9378026422 +05 24 51.462293664   8.70 8.29     F0 73 0
10 * bet CrB a2* 15 27 49.7315305 +29 06 20.522375 4.08 3.97 3.68 3.50 3.45 F2VpSrCrEuSi 665 0
11 * 33 Lib a2* 15 29 34.7422042672 -17 26 27.375775287 7.22 7.07 6.69     F0VspEuGdSr 240 0
12 V* V694 CrA a2* 18 12 25.8347315452 -37 45 09.274292137   8.34 7.92     ApSrCrEu 108 0
13 * 10 Aql a2* 18 58 46.9239770704 +13 54 23.944546333 6.23 6.14 5.89     A7VpSrEu_Ksn 275 0
14 * gam Equ a2* 21 10 20.5001160337 +10 07 53.682085548 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 523 0
15 V* BP Gru a2* 23 01 46.8212643426 -44 50 26.878058323   7.99 7.52     ApSrSi: 120 0

    Equat.    Gal    SGal    Ecl

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2021.07.23-17:21:05

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