1ES 1113+432: Luminous, soft X-ray outburst from a nearby cataclysmic variable (AR Ursae Majoris)

Remillard, R. A.; Schachter, J. F.; Silber, A.; Slane, Patrick

doi:10.1086/174063

Cited by 25 publications

(27 citation statements)

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“…Wenzel (1993) by studying AR UMa's light variations extending 32 years concluded it to be a cataclysmic variable. Remillard et al (1994) identified AR UMa as a soft Xray source in the Einstein survey. From ellipsoidal variations they identified the orbital period as 1.932 hr.…”

Section: Am Hermentioning

confidence: 99%

Long-Term Monitoring of Polars

Kalomeni

2011

Proc. IAU

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Section: Am Hermentioning

confidence: 99%

Long-Term Monitoring of Polars

Kalomeni

2011

Proc. IAU

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“…A literature search revealed a recently identified CV, AR UMa, within the error box. AR UMa, previously identified as an oxygen-rich, semiirregular system with period of 69 days (Jura k Kleinmann 1992), has recently been reclassified by (Remillard et al 1994) as an AM Her type system. Fortuitously, Remillard (private communication) obtained optical spectra of this source on 13 December, 1994 which showed enhanced emission thus confirming our identification of this source in outburst.…”

Section: Roussel-dupre Et Almentioning

confidence: 99%

The ALEXIS Point Source Detection Effort

Roussel-Dupré

Bloch

Ryan

et al. 1996

International Astronomical Union Colloquium

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Los Alamos National Laboratory's ALEXIS satellite (a wide area EUV monitoring instrument) was launched April 25, 1993. Due to the damage sustained at launch by the satellite, the ALEXIS project team has had to spend over a year devising new methods to determine spacecraft attitude knowledge, essential for putting photons back on the sky correctly. These efforts have been successful and currently the ALEXIS attitude solutions are precise to better than 0.5 degree close to the original 0.25 degree pre-flight specification. This paper will discuss the number and types of point sources that have been revealed in the ALEXIS data, to date. We will also discuss ALEXIS observations of the June, 1994 super outburst of the Cataclysmic Variable VW Hyi, a program to look for simultaneous EUV emission from Gamma Ray Bursts, as well as an effort to detect EUV transients with a 12 -24 hour response time.

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“…Its optical observations show that it often changes between high and low brightness states, remaining in the low state for approximately 90% of the time. During the low state, ellipsoidal variations reveal an orbital period of 1.932 hr (Remillard et al 1994), and both the WD and the M dwarf (MD) donor star can be detected from optical spectra.…”

Section: Introductionmentioning

confidence: 99%

Time-Variable Aluminum Absorption in the Polar Ar Ursae Majoris, and an Updated Estimate for the Mass of the White Dwarf

Justham

Liu

et al. 2016

ApJ

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We present spectra of the extreme polar AR Ursae Majoris (AR UMa), which display a clear Al I absorption doublet, alongside spectra taken less than a year earlier in which that feature is not present. Re-examination of earlier SDSS spectra indicates that the Al I absorption doublet was also present ≈8 years before our first nondetection. We conclude that this absorbing material is unlikely to be on the surface of either the white dwarf (WD) or the donor star. We suggest that this Al I absorption feature arises in circumstellar material, perhaps produced by the evaporation of asteroids as they approach the hot WD. The presence of any remaining reservoir of rocky material in AR UMa might help to constrain the prior evolution of this unusual binary system. We also apply spectral decomposition to find the stellar parameters of the M dwarf companion, and attempt to dynamically measure the mass of the WD in AR UMa by considering both the radial velocity curves of the H β emission line and the Na I absorption line. Thereby we infer a mass range for the WD in AR UMa of 0.91 M e <M WD <1.24 M e .

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1ES 1113+432: Luminous, soft X-ray outburst from a nearby cataclysmic variable (AR Ursae Majoris)

Cited by 25 publications

References 0 publications

Long-Term Monitoring of Polars

Long-Term Monitoring of Polars

The ALEXIS Point Source Detection Effort

Time-Variable Aluminum Absorption in the Polar Ar Ursae Majoris, and an Updated Estimate for the Mass of the White Dwarf

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