Optical and X-ray Studies of Ten X-ray Selected Cataclysmic Binaries

Abstract

We report on ground-based optical observations of ten cataclysmic binaries that were discovered through their X-ray emission. Time-resolved radial velocity spectroscopy yields unambiguous orbital periods for eight objects and ambiguous results for the remaining two. The orbital periods range from 87 min to 9.38 hr. We also obtained time-series optical photometry for six targets, four of which have coherent pulsations. These periods are 1218 s for 1RXS J045707.4+452751, 628 s for AX J1740.2-2903, 477 s for AX J1853.3-0128, and 935 s for IGR J19267+1325. A total of seven of the sources have coherent oscillations in X-rays or optical, indicating that they are intermediate polars (DQ Herculis stars). Time-resolved spectroscopy of one object, Swift J2218.4+1925, shows that it is an AM Herculis star, or polar, and IGR J19552+0044 may also be in that class. For another object, Swift J0476.2-1611, we find an orbital period of 9.384 hr and detect the spectrum of the secondary star. The secondary's spectral contribution implies a distance of 900 (+190, -150) pc, where the error bars are estimated using a Monte Carlo technique to account for correlated uncertainties.

Accepted for publication in The Astronomical Journal. 38 pages, 16 figures Revised to include a correct finding chart for RX J0457+45

References in corpus (9)

• The Fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)
• The 70 Month Swift-BAT All-Sky Hard X-Ray Survey
• The Donor Stars of Cataclysmic Variables
• Unveiling the nature of INTEGRAL objects through optical spectroscopy. VII. Identification of 20 Galactic and extragalactic hard X-ray sources
• Chandra Localizations and Spectra of INTEGRAL Sources in the Galactic Plane: The Cycle 9 Sample
• An X-ray Search for Compact Central Sources in Supernova Remnants II: Six Large Diameter SNRs
• Newly Discovered Cataclysmic Variables from the INT/WFC Photometric H alpha Survey of the Northern Galactic Plane
• A Search for New Galactic Magnetars in Archival Chandra and XMM-Newton Observations
• RXTE confirmation of the Intermediate Polar status of Swift J0732.5-1331

Cited by in corpus (22)

• Magnetic White Dwarfs
• Evidence for reduced magnetic braking in polars from binary population models
• Hard X-ray Cataclysmic Variables
• Low-Mass X-ray Binaries
• Broad-band characteristics of seven new hard X-ray selected cataclysmic variables
• The Swift Bulge Survey: Motivation, Strategy, and First X-ray Results
• X-ray and Optical Study of the Gamma-ray Source 3FGL J0838.8$-$2829: Identification of a Candidate Millisecond Pulsar Binary and an Asynchronous Polar
• Optical Studies of 15 Hard X-ray Selected Cataclysmic Binaries
• A Trip to the Cataclysmic Binary Zoo: Detailed Follow-Up of 35 Recently-Discovered Systems
• IGR J19552+0044: A new asynchronous short period polar: "Filling the gap between intermediate and ordinary polars"
• Optical Studies of Thirteen Hard X-ray Selected Cataclysmic Binaries from the Swift-BAT Survey
• INTEGRAL view on Cataclysmic Variables and Symbiotic Binaries
• The nature of fifty Palermo Swift-BAT hard X-ray objects through optical spectroscopy
• The Orbital Period vs. Absolute Magnitude Relationship of Intermediate Polars: Implications for Low States and Outbursts
• Hard X-ray luminosity functions of cataclysmic variables: Joint Swift/BAT and Gaia data
• Swift J2218.4+1925: a new hard X-ray selected Polar observed with XMM-Newton
• The true nature of Swift J0746.3-1608: a possible Intermediate Polar showing accretion state changes
• A Step towards Unveiling the Nature of Three Cataclysmic Variables: LS Cam, V902 Mon, and SWIFT J0746.3-1608
• Swift J0525.6+2416 and IGR J04571+4527: two new hard X-ray selected magnetic cataclysmic variables identified with XMM-Newton
• An Optical Study of Two VY Sculptoris-Type Cataclysmic Binary Stars: V704 And and RX J2338+431
• Optical Studies of Ten Hard X-ray Selected Cataclysmic Binaries
• High-speed photometry of faint cataclysmic variables - IX. Targets from multiple transient surveys