J/AcA/62/67 ASAS photometry of ROSAT sources (Kiraga, 2012)
ASAS photometry of ROSAT sources.
I. Periodic variable stars coincident with bright sources from the
ROSAT All Sky Survey.
Kiraga M.
<Acta Astron., 62, 67-95 (2012)>
=2012AcA....62...67K 2012AcA....62...67K
ADC_Keywords: Stars, variable ; X-ray sources ; Photometry ; Equivalent widths
Keywords: stars: variables: general - stars: rotation - stars: activity -
X-rays: stars
Abstract:
Photometric data from the ASAS - South (declination less than 29°)
survey have been used for identification of bright stars located near
the sources from the ROSAT All Sky Survey Bright Source Catalog
(RBSC). In total 6028 stars brighter than 12.5mag in I- or V-bands
have been selected and analyzed for periodicity. Altogether 2302
variable stars have been found with periods ranging from 0.137d to
193d. Most of these stars have X-ray emission of coronal origin with
a few cataclysmic binaries and early type stars with colliding winds.
Whenever it was possible we collected data available in the literature
to verify periods and to classify variable objects.
Description:
The catalog includes 1936 stars (1233 new) considered to be variable
due to presence of spots (rotationally variable), 127 detached
eclipsing binary stars (33 new), 124 contact binaries (11 new), 96
eclipsing stars with deformed components (19 new), 13 ellipsoidal
variables (4 new), 5 miscellaneous variables and one pulsating RR Lyr
type star (blended with an eclipsing binary). More than 70% of new
variable stars have amplitudes smaller than 0.1mag, but for ASAS
063656-0521.0 we have found the largest known amplitude of brightness
variations due to the presence of spots (up to DV=0.8mag).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 253 2302 Catalog of variable stars
remarks.dat 268 2174 Remarks
refs.dat 169 345 References
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See also:
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
II/264 : ASAS Variable Stars in Southern hemisphere (Pojmanski+, 2002-05)
J/AcA/63/53 : ASAS photometry of ROSAT sources. II (Kiraga+, 2013)
Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- ASAS ASAS name (hhmmss+ddmm.s)
15- 19 F5.2 arcsec Sep ? Distance between the formal ASAS position
and related object from SIMBAD database
(one pixel of ASAS detector=14")
21- 50 A30 --- Name Simbad name
53- 58 A6 --- Type Simbad type
60- 66 F7.2 mas/yr pmRA ? Simbad proper motion in right ascension
68- 74 F7.2 mas/yr pmDE ? Simbad proper motion in declination
76- 81 F6.2 mas plx ? Simbad heliocentric parallax
82- 88 F7.2 km/s RV ? Simbad radial velocity
92 A1 --- l_W(Li) Limit flag on W(Li)
93- 97 F5.2 0.1nm W(Li) ? Equivalent width of the lithium line at
λ=6704Å
98 A1 --- u_W(Li) [?] Uncertainty flag on W(Li)
99 A1 --- l_vsini Limit flag on vsini
100-104 F5.1 km/s vsini ? Simbad projected rotational velocity
105 A1 --- f_vsini [ab?] Flag on vsini (1)
107-108 A2 --- vd Visual companions (2)
111-114 A4 --- bin Close or spectroscopic companions (3)
118-123 F6.3 mag Bmag ? Simbad B magnitude
125-130 F6.3 mag Vmag ? Simbad V magnitude
132-142 A11 --- SpT Simbad MK spectral type
144-147 I4 --- nI Number of ASAS observations in the I-band
149-154 F6.3 mag <Imag> ? ASAS mean magnitude in the I-band
156-160 F5.3 mag sImag ? ASAS dispersion of the I-band measurements
164-167 I4 --- nV Number of ASAS observations in the V-band
169-174 F6.3 mag <Vmag> ? ASAS mean magnitude in the V-band
176-180 F5.3 mag sVmag ? ASAS dispersion of the V-band measurements
183-187 F5.2 mag BCI ? Adopted bolometric correction for I-band (4)
189-193 F5.3 ct/s CRate ROSAT Bright Source Catalog (IX/10) number of
counts per second (0.1-2.0keV)
195-199 F5.3 ct/s e_CRate Error on CRate
201-205 F5.2 --- HR1 ROSAT Bright Source Catalog (IX/10) hardness
ratio HR1, (H-S)/(H+S), H=0.5-2keV, S=0.1-0.4keV
207-210 F4.2 --- e_HR1 Error on HR1
212-216 F5.2 [-] logX/b ? logarithm (base 10) of the X-ray to the
bolometric flux ratio
219-222 F4.2 [-] e_logX/b ? Error on logX/b
225-234 F10.6 d Per Adopted period of luminosity changes
238-242 F5.3 mag Iamp lower limit for maximum amplitude of the
I-band variability
244-248 F5.3 mag Vamp lower limit for maximum amplitude of the
V-band variability
250-253 A4 --- Var Information about the photometric variability
type (5)
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Note (1): Flag on vsini as follows:
a = there are substantial differences in vsin i values found in literature
b = data about vsini are probably related to a companion star
Note (2): Visual companions flag as follows:
- = no known visual companion
b = blended with much fainter star or stars (information based on visual
inspection of DSS frames - usually DSS-2-red)
B = blended with a star or stars of comparable brightness (information
based on visual inspection of DSS frames - usually DSS-2-red)
c = close visual companion (visual binary) much fainter than the primary
star (information based on SIMBAD database or literature)
C = close visual companion of comparable brightness (information based on
SIMBAD database or literature)
Note (3): Close or spectroscopic companions flag as follows:
p = photometry may indicate a close companion
P = definitely eclipsing binary (based on photometric data)
SB1 = spectroscopic binary (single lined)
SB2 = spectroscopic binary (double lined)
SB3 = triple spectroscopic systems
SB4 = quadruple spectroscopic systems
? = there is no data about spectroscopic variability (no radial velocity
measurement or single radial velocity measurement, no spectroscopic
lines of secondary star) and there is no photometric indication of
close companion
no = radial velocity measurements indicate constant radial velocity (no
close companion star detected)
C = composite spectrum of two or more stars, but without noticeable changes
in the radial velocity
Note (4): adopted bolometric correction for the I-band (BCI ), based on (V-I)
color (calculated from mean I- and V-band magnitudes) using a fit to
atmospheric models presented by Bessel et al. (1998, Cat. J/A+A/333/231)
in the form BCI=-0.08+1.86(V-I)-1.33(V-I)2+0.251(V-I)3 for values of (V-I)
in the range of (0-1.5), and a slightly changed formula given by Reid and
Gilmore (1984MNRAS.206...19R 1984MNRAS.206...19R) for values of (V-I) in the range of (1.5-4.6):
BCI=-0.31(V-I)+1.03. The value of the free parameter is changed from 1.05
to 1.03 to obtain continuity with the formula for smaller values of (V-I).
There are 5 stars without V-band measurements and 6 stars without I-band
measurements. We have not calculated bolometric corrections for these stars.
Note (5): Information about the photometric variability type as follows:
ED = detached eclipsing binary (127 stars)
EB = close eclipsing binary with deformed component, and unequal depths
of eclipses (96 stars)
EC = contact eclipsing binary (124 stars)
Ell = variability due to the deformation of a star in a close binary system
(13 stars)
rot = rotational variability due to the presence of spots (1936 stars)
puls = variability due to stellar pulsations (1 star)
msc = the variability is difficult to interpret (5 stars)
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Byte-by-byte Description of file: remarks.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- ASAS ASAS name (hhmmss+ddmm.s)
15-268 A254 --- Rem Remarks (1)
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Note (1): we put our own remarks and data from the literature about
particular objects. Information from different sources is separated
by semicolons and may include:
P_ACVS = period from ASAS Catalog of Variable Stars
Pphot = photometric period found in the literature (other sources then ACVS)
n(vrad) = number of radial velocity measurements in cited paper
sig(vrad) = dispersion of radial velocity measurements given in cited paper
Porb = spectroscopic orbital period (with K1 and K2 radial velocity
semiamplitudes when available)
RS = RS CVn type variable star - coronally active evolved star in a close
binary system
RS? = probably RS CVn type star (based on photometric behavior and X-ray
data), but its binarity should be confirmed
EW Li line = equivalent width of Li line at 6704Å
vis bin = visual binary star with a given separation and luminosity contrast
given by the difference in magnitudes at given band, or measured
flux ratio at given band
F03 = star is listed in the catalog of Fuhrmeister and Schmitt (2003,
Cat. J/A+A/403/247) and has variable X-ray emission
References are explained in the "refs.dat" file.
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Byte-by-byte Description of file: refs.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- Ref Reference code, if used
9- 27 A19 --- BibCode BibCode
29- 56 A28 --- Aut Author's name
58-169 A112 --- Com Comments
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History:
Copied at ftp://ftp.astrouw.edu.pl/acta/2012/kir_67
References:
Kiraga & Stepien, Paper II, 2013AcA....63...53K 2013AcA....63...53K, Cat. J/AcA/63/53
(End) Patricia Vannier [CDS] 04-Jun-2012