J/AJ/155/247 Radial velocities of 6 X-ray cataclysmic binaries (Halpern+, 2018)
Optical studies of 15 hard X-ray selected cataclysmic binaries.
Halpern J.P., Thorstensen J.R., Cho P., Collver G., Motsoaledi M.,
Breytenbach H., Buckley D.A.H., Woudt P.A.
<Astron. J., 155, 247 (2018)>
=2018AJ....155..247H 2018AJ....155..247H (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, cataclysmic ; Stars, variable ; Binaries, X-ray ;
Radial velocities
Keywords: novae, cataclysmic variables - X-rays: binaries
Abstract:
We conducted time-resolved optical spectroscopy and/or time-series
photometry of 15 cataclysmic binaries that were discovered in hard X-ray
surveys by the Swift Burst Alert Telescope and the International Gamma-Ray
Astrophysics Laboratory, with the goal of measuring their orbital periods
and searching for spin periods. Four of the objects in this study are
new optical identifications: Swift J0535.2+2830, Swift J2006.4+3645,
IGR J21095+4322, and Swift J2116.5+5336. Coherent pulsations are detected
from three objects for the first time, Swift J0535.2+2830 (1523 s),
2PBC J1911.4+1412 (747 s), and 1SWXRT J230642.7+550817 (464 s), indicating
that they are intermediate polars (IPs). We find two new eclipsing systems
in time-series photometry: 2PBC J0658.0-1746, a polar with a period of
2.38 hr, and Swift J2116.5+5336, a disk system that has an eclipse period
of 6.56 hr. Exact or approximate spectroscopic orbital periods are found
for six additional targets. Of note is the long 4.637-day orbit for
Swift J0623.9-0939, which is revealed by the radial velocities of the
photospheric absorption lines of the secondary star. We also discover
a 12.76 hr orbital period for RX J2015.6+3711, which confirms that the
previously detected 2.00 hr X-ray period from this star is the spin period
of an IP, as inferred by Coti Zelati et al. (2016MNRAS.456.1913C 2016MNRAS.456.1913C). These
results support the conclusion that hard X-ray selection favors
magnetic CVs, with IPs outnumbering polars.
Description:
Our instrumentation as well as our reduction and analysis procedures are
similar to those described in Thorstensen & Halpern 2013, J/AJ/146/107 and
Halpern & Thorstensen 2015, J/AJ/150/170 (Papers I and II), and they
are summarized in this section. Nearly all of our optical data are from
the MDM Observatory, which comprises the 1.3 m McGraw-Hill telescope and
the 2.4 m Hiltner telescope, both on the southwest ridge of Kitt Peak,
Arizona. Most of our radial velocity studies used the modular spectrograph
(modspec) on either the 2.4 m or 1.3 m telescope. In addition to wavelength
calibrations using comparison lamps of Hg, Ne, and Xe taken during twilight,
we used the night-sky O I λ5577 line to track and correct for
spectrograph flexure during the night. The projected slit width was 1"
on the 2.4 m, and ∼1.8" on the 1.3 m. At the 2.4 m, we rotated the
instrument to orient the slit close to the parallactic angle when at large
hour angles and zenith distances.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 136 20 Basic data on stars observed
table2.dat 39 247 Radial velocities
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See also:
V/123 : Catalog of Cataclysmic Variables (Downes+ 2001-2006)
I/284 : The USNO-B1.0 Catalog (Monet+ 2003)
V/113 : Cataclysmic Binaries, LMXBs, and related objects (Ritter+, 2003)
I/322 : UCAC4 Catalogue (Zacharias+, 2012)
I/337 : Gaia DR1 (Gaia Collaboration, 2016)
J/PASP/122/1285 : Radial-velocities of 20 cataclysmic var. (Thorstensen+, 2010)
J/AJ/144/81 : Spectroscopy and photometry of CV candidates
(Thorstensen+, 2012)
J/AJ/146/107 : Velocity curves of 10 cataclysmic binaries
(Thorstensen+, 2013)
J/AJ/149/128 : Radial velocities of 29 CVs (Thorstensen+, 2015)
J/AJ/150/170 : Radial velocities of 7 cataclysmic binaries (Halpern+, 2015)
J/AJ/152/226 : Radial velocities of 35 cataclysmic variables
(Thorstensen+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 23 A23 --- Star Star name
25- 36 A12 --- SName Short name used in Table 2
38- 39 I2 h RAh Hour of Right Ascension (J2000) (1)
41- 42 I2 min RAm Minute of Right Ascension (J2000) (1)
44- 49 F6.3 s RAs Second of Right Ascension (J2000) (1)
51 A1 --- DE- Sign of the Declination (J2000) (1)
52- 53 I2 deg DEd Degree of Declination (J2000) (1)
55- 56 I2 arcmin DEm Arcminute of Declination (J2000) (1)
58- 62 F5.2 arcsec DEs Arcsecond of Declination (J2000) (1)
64- 67 F4.1 mag Vmag [14.1/19.7] Approximate V band magnitude
69 A1 --- r_Vmag [ABDS] Reference for Vmag (2)
71- 74 F4.1 mag gmag [14.7/20.1]? Average g magnitude from Pan-STARRS
76- 82 A7 --- Data Type(s) of data (3)
84- 85 A2 --- Class Classification (4)
87 A1 --- l_Porb [~] Limit flag on Porb
88- 96 F9.7 d Porb [0.099137/4.637]? Orbital period
97- 98 A2 --- u_Porb [: ] Uncertainty flag on Porb
100-108 F9.7 d e_Porb [3e-07/0.019]? Uncertainty in Porb
110-117 F8.3 s Pspin [464.452/7196]? Spin period
119-124 F6.3 s e_Pspin [0.001/11]? Uncertainty in Pspin
125 A1 --- n_Pspin [P] Denotes a Pspin equal to the Porb
127-133 A7 --- Ref Reference(s) for periods (5)
135-136 I2 --- Nrv [23/63]? Number of RV data in Table 2
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Note (1): Coordinates are from the Gaia first data release
(Gaia Collaboration et al. 2016, Cat. I/337). They are referred to ICRS
(essentially equinox J2000), but are for epoch 2015.0 (i.e., for proper motion
correction).
Note (2): Source of approximate V magnitude defined as follows:
A = APASS (Henden et al. 2012JAVSO..40..430H 2012JAVSO..40..430H), as listed in the UCAC4
(Zacharias et al. 2013, Cat. I/322);
B = Interpolated from Schmidt-plate magnitudes in USNO B1.0 (Monet et al.
2003, Cat. I/284);
D = Our direct image;
S = Our spectrophotometry.
Note (3): Types of data presented here defined as follows:
I = Optical spectroscopic identification;
S = Time-resolved spectroscopy;
T = Time-series photometry.
Note (4): Classifications are defined as follows:
AM = AM Her star or polar;
DQ = DQ Her star or intermediate polar (IP) (evidence for pulsations).
Note (5): References for periods as follows:
1 = This paper, optical;
2 = Bernardini et al. (2017MNRAS.470.4815B 2017MNRAS.470.4815B), X-ray;
3 = Bernardini et al. (2017MNRAS.470.4815B 2017MNRAS.470.4815B), optical;
4 = Halpern & Thorstensen (2015, J/AJ/150/170; Paper II), X-ray;
5 = Coti Zelati et al. (2016MNRAS.456.1913C 2016MNRAS.456.1913C), X-ray;
6 = Nichelli et al. (2009ATel.2354....1N 2009ATel.2354....1N), X-ray.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 12 A12 --- Star Abbreviated star name
14- 23 F10.4 d BJD [54281.8863/58077.728] Barycentric Julian Date
of mid-integration (BJD-2400000.0, UTC)
25- 28 I4 km/s RVHa [-175/208]? Hα radial velocity
30- 31 I2 km/s e_RVHa [1/45]? Uncertainty in RVHa
33- 36 I4 km/s RVabs [-236/179]? Absorption-line radial velocity (1)
38- 39 I2 km/s e_RVabs [9/43]? Uncertainty in RVabs
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Note (1): From cross-correlation.
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History:
From electronic version of the journal
References:
Thorstensen & Halpern Paper I. 2013AJ....146..107T 2013AJ....146..107T, Cat. J/AJ/146/107
Halpern & Thorstensen Paper II. 2015AJ....150..170H 2015AJ....150..170H, Cat. J/AJ/150/170
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 18-Dec-2018