J/A+AS/133/1 New variable chemically peculiar stars (Paunzen+ 1998)
New variable chemically peculiar stars identified in the Hipparcos archive
Paunzen E., Maitzen H.M.
<Astron. Astrophys. Suppl. Ser. 133, 1 (1998)>
=1998A&AS..133....1P 1998A&AS..133....1P (SIMBAD/NED BibCode)
ADC_Keywords: Stars, peculiar ; Stars, variable ; Rotational velocities
Keywords: stars: chemically peculiar - stars: variables - stars: early type
Description:
Since variability of chemically peculiar (CP) stars plays an important
role for the astrophysical explanation of their outstanding behaviour,
we have identified new variable CP stars listed in Renson's catalogue
using the extensive Hipparcos Variability Annex. From the 293 objects
found, 33 were excluded because they are not CP stars and/or have no
period listed, half of the remaining stars are newly identified and
half had been already included in the catalogue of variable CP stars
by Catalano & Renson (1997, Cat. J/A+AS/121/57).
Most of the newly identified variability is due to an apparent
magnetic field coupled with stellar rotation (oblique rotator model).
The constraints of this model are fulfilled for all but three CP2
stars.
Variations of bona fide Am-Fm stars are exclusively explained by
eclipses of binary systems. Furthermore eight candidates of the gamma
Doradus group (pulsating Am-Fm stars) were detected.
Table 1 (table1.dat) presents the newly identified chemically peculiar
stars.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 87 130 New variable chemically peculiar stars identified
in the Hipparcos archive
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See also:
III/162 : General Catalogue of Ap and Am stars (Renson+ 1991)
III/199 : Observed Periods of Ap and Bp stars (Catalano+ 1998)
I/196 : Hipparcos Input Catalogue, Version 2 (Turon+ 1993)
J/A+AS/121/57 : Ap stars periodicity (Catalano+ 1997)
J/A+AS/128/573 : ubvyΔa photometry of Renson stars (Maitzen+ 1998)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- HD HD number with probability mark according
to Renson (1991)
7 A1 --- n_HD [?*/] Probability mark according to
Renson (1991, Cat. III/162) (1)
9- 14 I6 --- HIC HIC (Cat. I/196) number
16- 20 I5 --- RNS Number from Renson (1991, Cat. III/162)
22- 26 A5 --- Type Type of variations
28- 32 F5.3 mag Min Minimum of the variations
34 A1 --- l_Max Limit flag on Max
35- 40 F6.3 mag Max Maximum of the variations
42- 51 F10.7 d Period Period of the variations
53- 60 F8.4 d Epoch Epoch as in the HVA (Hipparcos
Variability Annex)
62- 63 I2 mmag Deltaa ? Δa index (2)
65- 68 F4.1 --- Deltap ? Δp index (3)
70 A1 --- l_vsini Limit flag on vsini
71- 73 I3 km/s vsini ? vsini value
75- 87 A13 --- Spec Spectral type according to Renson (1991,
Cat. III/162))
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Note (1): Indication of the probability that the star belongs to the
considered category:
'/' denotes a star improperly considered Ap or Am
'?' doubtful nature
'*' well-known Ap or Am star
' ' other cases
Note (2): Δa is a photometric index that measure the intensity of the
depression at λ5200Å.
All stars with Δa≥0.010mag are considered as peculiar stars.
See Maitzen et al., 1976A&A....51..223M 1976A&A....51..223M, for more details.
Note (3): Δp is a photometric index, depending of (b-y), m1, c1 and
β photometry, able to detect CP2 stars.
See Masana et al., Cat. J/A+AS/128/265, for more details.
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Acknowledgements: E. Paunzen
(End) Patricia Bauer [CDS] 01-Oct-1998