J/MNRAS/429/119 STEREO non-magnetic chemically peculiar stars (Paunzen+, 2013)
A photometric study of chemically peculiar stars with the STEREO satellites.
II. Non-magnetic chemically peculiar stars.
Paunzen E., Wraight K.T., Fossati L., Netopil M., White G.J., Bewsher D.
<Mon. Not. R. Astron. Soc., 429, 119-125 (2013)>
=2013MNRAS.429..119P 2013MNRAS.429..119P
ADC_Keywords: Stars, peculiar ; Rotational velocities
Keywords: techniques: photometric - catalogues - stars: chemically peculiar -
stars: rotation - stars: variables: δ Scuti
Abstract:
We have analysed the photometric data obtained with the STEREO
spacecraft for 558 non-magnetic chemically peculiar (CP) stars to
search for rotational and pulsational variability. Applying the
Lomb-Scargle and the phase dispersion minimization methods, we have
detected photometric variability for 44 objects from which 35 were
previously unknown. The new objects are all bright stars on the
ecliptic plane (magnitude range 4.7<V<11.7) and will therefore be of
great interest to studies of stellar structure and evolution. In
particular, several show multiple signals consistent with hybrid
δ Scuti and γ Doradus pulsation, with different
periodicities allowing very different regions of the stellar interior
to be studied. There are two subgroups of stars in our sample: the
cool metallic line Am (CP1) and the hot HgMn (CP3) stars. These
objects fall well inside the classical instability strip where δ
Scuti, γ Doradus and slowly pulsating B-type stars are located.
We also expect to find periods correlated to the orbital period for
CP1 objects as they are mostly members of binary systems. For CP3
stars, rotationally induced variability is still a matter of debate.
Although surface spots were detected, they are believed to produce
only marginal photometric amplitudes. So, periods from several hours
to a few days were expected for these two star groups. The
STEREO/HI-1 data are well matched to studies of this frequency
domain, owing to the cadence of approximately 40-min and multiple
epochs over four and a half years. The remaining 514 stars are likely
to be constant in the investigated range from 0.1 to 10d. In some
cases, the presence of blending or systematic effects prevented us
from detecting any reliable variability and in those cases we
classified the star as constant. We discuss our results in comparison
to already published ones and find a very good agreement. Finally, we
have calibrated the variable stars in terms of the effective
temperature and luminosity in order to estimate masses and ages. For
this purpose, we used specifically developed calibrations for CP stars
and, when available, Hipparcos parallaxes. All but two objects
cover the stellar mass range from 1.5 to 5M☉ and are located
between the zero- and terminal-age main sequence.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 78 399 Basic properties of the CP1 and CP3 stars identified
as constant or for which the quality of the data
prevented the detection of any variability
table2.dat 109 115 Basic properties of the CP1 and CP3 stars identified
as constant or probably constant after the
individualized analysis
table3.dat 194 44 Properties of the CP1 and CP3 stars identified as
photometrically variable
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See also:
III/260 : General Catalogue of Ap and Am stars (Renson+ 2009)
J/MNRAS/420/757 : STEREO magnetic chemically peculiar stars (Wraight+, 2012)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name Name
17- 21 I5 --- R09 Identification number by Renson & Manfroid
(2009A&A...498..961R 2009A&A...498..961R, Cat. III/260,
Renson NNNNN in Simbad)
24- 32 F9.5 deg RAdeg Right ascension (J2000)
34- 42 F9.5 deg DEdeg Declination (J2000)
44- 48 F5.2 mag Vmag Average V magnitude
50- 58 A9 -- SpType MK spectral type from Renson & Manfroid
2009A&A...498..961R 2009A&A...498..961R, Cat. III/260)
60- 63 A4 --- Class CP classification (G3)
67- 71 F5.1 km/s vsini ? Average projected rotational velocity
73- 76 F4.1 km/s e_vsini ? rms uncertainty on vsini
78 I1 --- o_vsini [1/7]? Number of averaged vsini
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name Name
17- 21 I5 --- R09 Identification number by Renson & Manfroid
(2009A&A...498..961R 2009A&A...498..961R, Cat. III/260)
24- 32 F9.5 deg RAdeg Right ascension (J2000)
34- 42 F9.5 deg DEdeg Declination (J2000)
44- 48 F5.2 mag Vmag Average V magnitude
50- 62 A13 -- SpType MK spectral type from Renson & Manfroid
(2009A&A...498..961R 2009A&A...498..961R, Cat. III/260)
64- 67 A4 --- Class CP classification (G3)
69- 74 F6.4 d Per ? Period
76- 81 F6.4 d e_Per ? rms uncertainty on Per
83- 85 A3 --- Rem [WBSC ] Analysis remark (G1)
87- 89 A3 --- r_Plit Reference for literature period (G2)
90 A1 --- --- [:]
91- 95 F5.3 d Plit ? Literature period
98-102 F5.1 km/s vsini ? Average projected rotational velocity
104-107 F4.1 km/s e_vsini ? rms uncertainty on vsini
109 I1 --- o_vsini [1/4]? Number of averaged vsini
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 15 A15 --- Name Name
17- 21 I5 --- R09 Identification number by Renson & Manfroid
(2009A&A...498..961R 2009A&A...498..961R, Cat. III/260)
24- 32 F9.5 deg RAdeg Right ascension (J2000)
34- 42 F9.5 deg DEdeg Declination (J2000)
44- 48 F5.2 mag Vmag Average V magnitude
50- 62 A13 -- SpType MK spectral type from Renson & Manfroid
(2009A&A...498..961R 2009A&A...498..961R, Cat. III/260)
66- 69 A4 --- Class CP classification (G3)
71- 76 F6.4 d Per Period
79- 85 F7.5 d e_Per rms uncertainty on Per
87- 92 F6.4 d Per2 ? Second period
94- 99 F6.4 d Per3 ? Third period
101-109 F9.3 d MJD ? MJD of the epoch for the first recorded
maximum
111-112 A2 --- Rem [WBS* ] Analysis remark (G1)
114-131 A18 --- Plit Reference for literature period with
literature period(s) (G2)
133-137 F5.1 km/s vsini ? Average projected rotational velocity
139-142 F4.1 km/s e_vsini ? rms uncertainty on vsini
144 I1 --- o_vsini [1/5]? Number of averaged vsini
147-151 I5 K Teff ? Effective temperature
153-155 I3 K e_Teff ? rms uncertainty on Teff
157-158 I2 --- o_Teff [1/99]? Number of averaged temperature
(99 when Teff from Netopil et al.,
2008A&A...491..545N 2008A&A...491..545N)
162-165 F4.2 [Lsun] logL ? Luminosity
167-170 F4.2 [Lsun] e_logL ? rms uncertainty on logL
172 A1 --- n_logL [T] TAMS stage (1)
175-178 F4.2 Msun Mass ? Mass
180-183 F4.2 Msun e_Mass ? rms uncertainty on Mass
186-189 F4.2 --- tau [0/1]? Fractional age τ (fraction of
main sequence lifetime completed) (1)
191-194 F4.2 --- e_tau ? rms uncertainty on tau
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Note (1): the Zero-Age Main Sequence (ZAMS) corresponds to τ=0,
and the Terminal-Age Main Sequence (TAMS) corresponds to τ=1.
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Global notes:
Note (G1): Flag as follows:
B = possible presence of blending
S = systematic effects
* = exceptionally strong signal
W = weak signal
C = when we concluded the star was constant
Note (G2): References as follows:
B = Bychkov, Bychkova & Madej (2005,Cat. J/A+A/430/1143)
C98 = Catalano & Renson (1998A&AS..127..421C 1998A&AS..127..421C, Cat. III/199)
C01 = Renson & Catalano (2001, Cat. J/A+A/378/113)
S09 = Samus et al. (2009, GCVS, Cat. B/gcvs)
S11 = Smalley et al. (2011, Cat. J/A+A/535/A3)
W = Watson (2006, n Soc. Astron. Sci. Annu. Symp. 25. 2006. p. 47)
Note (G3): the chemically peculiar stars are subdivided into the classes:
CP1 = metallic-line stars (Am, Fm, ...)
CP2 = magnetic Ap stars
CP3 = HgMn stars
CP4 = He-weak stars
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History:
From electronic version of the journal
References:
Wraight et al., Paper I 2012MNRAS.420..757W 2012MNRAS.420..757W, Cat. J/MNRAS/420/757
(End) Patricia Vannier [CDS] 14-Mar-2014