J/A+A/477/907 Beta Cephei stars in the ASAS-3 data. I. (Pigulski+, 2008)
Beta Cephei stars in the ASAS-3 data.
I. Long-term variations of periods and amplitudes.
Pigulski A., Pojmanski G.
<Astron. Astrophys. 477, 907 (2008)>
=2008A&A...477..907P 2008A&A...477..907P
ADC_Keywords: Stars, early-type - Stars, OB - Stars, variable - Surveys
Keywords: stars: early-type - stars: oscillations - surveys
Abstract:
We analyse V-filter photometry of 41 known Beta Cephei-type stars. The
ASAS-3 photometry is combined with the archival data, if available, to
determine long-term stability of periods and amplitudes of excited
modes. We detected amplitude changes in three Beta Cephei stars,
BW Cru, V836 Cen, and V348 Nor. Period changes were found in KK Vel
and V836 Cen. Our analysis shows that intrinsic period changes are
more common among multiperiodic stars, apparently because they are
caused by some kind of mode interaction. In addition, we found new
modes for seven stars, and for ten others we provide new solutions or
remove ambiguities in the detected frequencies. One candidate hybrid
Beta Cephei/SPB star, HD 133823, is discovered.
Description:
Time-series V-filter ASAS-3 photometry for 41 known Beta Cephei stars
is presented. Out of the original aperture photometry, we chosen that
which had the smallest errors of magnitudes. In addition, measurements
made in different fields were accounted for zero point differences,
corrected for second-order extinction effects and detrended.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
stars.dat 148 41 Stars observed: names, and first mode parameters
(table1 and excerpts from table2 of paper)
lc1.dat 42 16374 Time-series photometry
--------------------------------------------------------------------------------
See also:
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+ 2002-05)
J/A+A/477/917 : Beta Cephei stars in the ASAS-3 data. II. (Pigulski+, 2007)
Byte-by-byte Description of file: stars.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Star Star name
13- 18 I6 --- HD ? HD number of the star (Cat. III/135)
20- 27 A8 --- DM BD/CPD star number
29- 41 A13 --- ASAS-3 ASAS-3 number (Cat. II/264)
43- 53 A11 --- Oname Other name of the star
56 I1 --- Modes Number of variation modes found
58- 62 F5.2 mag Vmag Johnson V magnitude
64- 68 F5.2 mag B-V ? Color index (B-V)
70- 74 F5.2 mag U-B ? Color index (U-B)
76- 85 A10 --- SpType MK spectral type
87- 88 I2 --- r_SpType ? Reference of spectral type (1)
90- 92 I3 --- Nobs Number of observations
95-102 F8.6 d-1 f1 Frequency of first mode
104-108 E5.0 d-1 e_f1 Mean error on f1
111-114 F4.1 mmag A1 ? Amplitude of first mode
116-118 F3.1 mmag e_A1 ? Mean error on A1
121-148 A28 --- Rem Remarks
--------------------------------------------------------------------------------
Note (1): references to the MK spectral types as follows:
1 = Garrison et al. (1977ApJS...35..111G 1977ApJS...35..111G)
2 = Houk (1982, Cat. III/80),
3 = Houk (1978, Cat. III/51),
4 = Houk & Cowley (1975, Cat. III/31),
5 = Evans et al. (2005A&A...437..467E 2005A&A...437..467E),
6 = Schild (1970ApJ...161..855S 1970ApJ...161..855S),
7 = Hill (1970MNRAS.150...23H 1970MNRAS.150...23H),
8 = L'epine et al. (2001AJ....122.3407L 2001AJ....122.3407L),
9 = Hill et al. (1974MNRAS.168..451H 1974MNRAS.168..451H),
10 = Morgan et al. (1953ApJ...118..318M 1953ApJ...118..318M),
11 = Walborn (1971ApJS...23..257W 1971ApJS...23..257W),
12 = Kilkenny et al. (1977MNRAS.178..123K 1977MNRAS.178..123K),
13 = FitzGerald (1987MNRAS.229..227F 1987MNRAS.229..227F),
14 = Whiteoak (1963MNRAS.125..105W 1963MNRAS.125..105W),
15 = spectral type on the Harvard system, Nesterov et al.
(1995A&AS..110..367N 1995A&AS..110..367N, Cat. III/182),
16 = Houk & Smith-Moore (Cat. III/133).
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lc1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 11 A11 --- Star Star name
13- 25 F13.5 d HJD Heliocentric Julian Day
28- 34 F7.4 mag Vmag Johnson V-filter magnitude
38- 42 F5.3 mag e_Vmag Error of Vmag, copied from original measurement
--------------------------------------------------------------------------------
Acknowledgements:
Andrzej Pigulski, pigulski(at)astro.uni.wroc.pl
(End) Andrzej Pigulski [UWr, Poland], Patricia Vannier [CDS] 04-Dec-2007