ASAS photometry of ROSAT sources. II. New variables from ASAS North 
survey

 M. Kiraga, K. Stepien

Abstract:
 We present a catalog of 307 optical counterparts of the
bright ROSAT X-ray sources, identified with the ASAS North survey data and
showing periodic brightness variations. They all have declination north of
$-25^o$. Other data available from the literature for the listed stars are
also included. All the tabulated stars are new variables, except 13
previously known, for which the revised values of period are given.

Byte-by-byte description of file catalog.dat

Column   Bytes  Format  units  description
 1        1-15   a15     -     RBSC designation of the X-ray source (1RXS
 Jhhmmss.spddmmss p=sign (+-)) 
 2       17-29   a13     -     ASAS designation of the optical counterpart
 to the RBSC source (format: hhmmsspddmm.m p=sign (+-))
 3       31-34   f4.1  arcsec  a distance between the position of the ROSAT object and ASAS optical counterpart  (note that one pixel of the ASAS detector $\approx$ 15'')
 4       36-43   a8      -     first  part of name of the object from the SIMBAD database
 5       45-61   a17     -     second part of name of the object from the SIMBAD database.
 6       63-71   a9      -     spectral type from SIMBAD, if available
 7       73-78   f6.1  mas/yr  proper motion in RA
 8       80-85   f6.1  mas/yr  proper motion in DEC
 9       87-90   i4      -     number of the observations in V band
10       92-97   f6.3   mag    mean ASAS V magnitude
11       99-103  f5.3   mag    standard deviation of ASAS V magnitude
12      105-110  f6.3   mag    J - magnitude of the adopted counterpart from the 2MASS catalog
13      112-113  i2      -     number of 2MASS J - band sources within 40'' from the ASAS source position
14      115-119  f5.3    -     total J band flux of all sources counted in Col. 13 and expressed in units of the flux from Col. 12 
15      122-127  f6.3   mag    the adopted  J_cor -magnitude of the ASAS object
 used for color index
16      129-133  f5.3   mag    the adopted (V-J_cor) color index (Col. 10 minus Col. 15)
17      135-140  f6.3    -     number of counts per second (RBSC data)
18      142-146  f5.3    -     error on counts (RBSC data)
19      148-152  f5.2    -     Hardness ratio HR1 (RBSC data)  
20      154-157  f4.2    -     error on HR1 (RBSC data)
21      159-164  f6.2    -     logarithm of the bolometric flux (in ergs/s/cm^2)
22      166-170  f5.2    -     Rx - logarithm of the X-ray (0.1-2.4 keV) to the
bolometric flux ratio
23      172-175  f4.2    -     error on Rx 
24      177-186  f10.6  days   P - adopted variability period 
25      188-191  f4.2   mag    Amp maximum amplitude of the V band variability
26      193-195  a3      -      variability type 
27      197-347  a151    -      remarks


variability type: rot - spotted rotator, ED - detached binary, EB
- beta Lyrae type binary, EC - contact binary, msc - miscellaneous)

remarks: here listed are available data on the values of the
projected rotational velocity (vsini), lithium line equivalent width (EW Li
line), X-ray variability, known optical variability, possible alternative
periods (due to aliases or incorrect variability type classification),
visual and spectroscopic companions.

The references to the data presented in remarks are writen in abbreviated
form and read: 
A00 = Alcala et al. 2000
Br06 = Broeg et al. 2006,
CCDM = Dommanget and Nys 2002,
dMM99 = de Medeiros and Mayor 1999,
dS09 = da Silva et al. 2009,
Dr07 = Dragomir et al. 2007
FS03 = Fuhrmeister and Schmitt 2003,
G09 = Guillout et al. 2009,
H11 = Hartman et al. 2011,
H31 = Hoffmeister 1931,
J12 = Janson et al. 2012,
Kr08 = Kraus et al. 2008,
L09 = Lebre et al. 2009,
LH98 = Li and Hu 1998,
MA10 = MartĂ­nez-ArnĂĄiz, R. et al. 2010,
M02 = Mochnacki et al. 2002,
N97 = Neuhaeuser et al. 1997,
P02 = Pojmanski 2002
S59 = Strohmeier 1959
T05 = Tachihara et al. 2005,
W07 = White et al. 2007,
WDS = Mason et al. 2001.