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Title:
A Possible Period for the K-Band Brightening Episodes of GX 17+2
Authors:
Bornak, Jillian; McNamara, Bernard J.; Harrison, Thomas E.; Rupen, Michael P.; Bandyopadhyay, Reba M.; Wachter, Stefanie
Affiliation:
AA(Department of Astronomy, New Mexico State University, 1320 Frenger Mall, Las Cruces, NM 88003, USA ; Visiting astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. ; ), AB(Department of Astronomy, New Mexico State University, 1320 Frenger Mall, Las Cruces, NM 88003, USA ; Visiting astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. ; Visiting astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation.; ), AC(Department of Astronomy, New Mexico State University, 1320 Frenger Mall, Las Cruces, NM 88003, USA ; Visiting astronomer, Kitt Peak National Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation. ; ), AD(NRAO, 1003 Lopezville Road, Socorro, NM 87801, USA ), AE(Department of Astronomy, University of Florida, Gainesville, FL 32611, USA ; Visiting astronomer, Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy (AURA) under cooperative agreement with the National Science Foundation.; ), AF( Spitzer Science Center, Caltech M/S 220-6, 1200 E. California Blvd., Pasadena, CA 91125, USA )
Publication:
The Astrophysical Journal Letters, Volume 701, Issue 2, pp. L110-L113 (2009). (ApJL Homepage)
Publication Date:
08/2009
Origin:
IOP
ApJ Keywords:
ISM: jets and outflows, radiation mechanisms: non-thermal, stars: individual: GX 17+2, stars: neutron, X-rays: binaries
DOI:
10.1088/0004-637X/701/2/L110
Bibliographic Code:
2009ApJ...701L.110B

Abstract

The low-mass X-ray binary and Z source GX 17+2 undergoes infrared K-band brightening episodes of at least 3.5 mag. The source of these episodes is not known. Prior published K-band magnitudes and new K-band measurements acquired between 2006 and 2008 suggest that the episodes last at least 4 hr and have a period of 3.01254 ± 0.00002 days. Future bright episodes can be predicted using the ephemeris JDmax(n) = 2454550.79829 + (3.01254 ± 0.00002)(n) days. A growing body of evidence suggests that the GX 17+2 could have a synchrotron jet, which could cause this activity.
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