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J/ApJ/831/89 Eclipsing LMXB at the center of 3FGL J0427.9-6704 (Strader+, 2016)

A new γ-ray loud, eclipsing low-mass X-ray binary. Strader J., Li K.-L., Chomiuk L., Heinke C.O., Udalski A., Peacock M., Shishkovsky L., Tremou E. <Astrophys. J., 831, 89-89 (2016)> =2016ApJ...831...89S (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, X-ray ; Photometry, UBVRI ; Photometry, infrared ; Gamma rays Keywords: binaries: spectroscopic; pulsars: general; stars: neutron; X-rays: binaries Abstract: We report the discovery of an eclipsing low-mass X-ray binary at the center of the 3FGL error ellipse of the unassociated Fermi/Large Area Telescope γ-ray source 3FGL J0427.9-6704. Photometry from OGLE and the SMARTS 1.3m telescope and spectroscopy from the SOAR telescope have allowed us to classify the system as an eclipsing low-mass X-ray binary (P=8.8hr) with a main-sequence donor and a neutron-star accretor. Broad double-peaked H and He emission lines suggest the ongoing presence of an accretion disk. Remarkably, the system shows separate sets of absorption lines associated with the accretion disk and the secondary, and we use their radial velocities to find evidence for a massive (∼1.8-1.9M) neutron-star primary. In addition to a total X-ray eclipse with a duration of ∼2200s observed with NuSTAR, the X-ray light curve also shows properties similar to those observed among known transitional millisecond pulsars: short-term variability, a hard power-law spectrum (Γ∼1.7), and a comparable 0.5-10keV luminosity (∼2.4x1033erg/s). We find tentative evidence for a partial (∼60%) γ-ray eclipse at the same phase as the X-ray eclipse, suggesting the γ-ray emission may not be confined to the immediate region of the compact object. The favorable inclination of this binary is promising for future efforts to determine the origin of γ-rays among accreting neutron stars. Description: We converted the OGLE instrumental magnitudes i and v into standard I and V filters using the equations I=i-0.338-0.0047(v-i) and V=v-0.066-0.072(v-i), with (v-i) assumed from a smoothed version of the light curve for epochs with only one filter available. We also converted the OGLE UTC HJD values into Barycentric Julian Date (BJD) on the Barycentric Dynamical Time (TDB) system. The OGLE-IV photometry comprise 368 epochs in I and 28 epochs in V, spanning 2010 March 07 to 2015 November 29 (Udalski+ 2015AcA....65....1U). From 2016 January 16 to May 1 (UT), we obtained optical BVI and near-IR H photometry of the source on most clear nights using ANDICAM on the SMARTS 1.3m telescope at CTIO. On a few nights multiple sets of observations were taken; the total number of epochs was 62-64 per band, depending on the band. The exposure time in each BVI was 300s; the on-source exposure time in H varied but was typically 500-600s. Objects: --------------------------------------------------------------------------- RA (ICRS) DE Designation(s) (Period) --------------------------------------------------------------------------- 04 27 56 -67 04.7 3FGL J0427.9-6704 = 2FGL J0427.2-6705 (P=0.366720) --------------------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 30 642 OGLE and SMARTS photometry of 3FGL J0427.9-6704
See also: J/ApJ/820/8 : 3FGL sources statistical classifications (Saz Parkinson+, 2016) J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015) J/ApJS/209/9 : Unidentified gamma-ray sources. IV. X-ray (Paggi+, 2013) J/ApJS/208/17 : 2nd Fermi LAT cat. of gamma-ray pulsars (2PC) (Abdo+, 2013) J/ApJS/207/19 : Hard X-ray survey from Swift-BAT 2004-2010 (Baumgartner+, 2013) J/AcA/63/1 : OGLE-IV Magellanic Bridge Data supernovae (Kozlowski+, 2013) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 15 F15.7 d BJD Barycentric Julian Date (TDB) of observation 17- 22 F6.3 mag mag [15.5/20.3] Photometric Vega magnitude in Band 24- 28 F5.3 mag e_mag [0.004/0.4] Uncertainty in mag 30 A1 --- Band [BVIH] Photometric band used in the observation
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 27-Jan-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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