Exploratory Spectroscopy of Magnetic Cataclysmic Variables Candidates and Other Variable Objects. II

Oliveira, A. S.; Rodrigues, C. V.; Martins, Murilo; Palhares, M. S.; Silva, Karleyne M. G.; Lima, Isabel J.; Jablonski, F.

doi:10.3847/1538-3881/ab6ded

Cited by 10 publications

(8 citation statements)

References 61 publications

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“…The system shows comparatively weak He iiλ4686 line emission and was reclassified by Oliveira et al (2020) as an intermediate polar. We do not share their interpretation and confirm J0953 as a synchronized polar.…”

Section: Rx J09531+1458 (=J0953) In Leomentioning

confidence: 99%

Neglected X-ray discovered polars

Beuermann

Burwitz

Reinsch

et al. 2021

A&A

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We report results on the ROSAT-discovered noneclipsing short-period polars RX J0154.0−5947, RX J0600.5−2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2−1925 collected over 30 years. We present accurate linear orbital ephemerides that allow a correct phasing of data taken decades apart. Three of the systems show cyclotron and Zeeman lines that yield magnetic field strengths of 36 MG, 19 MG, and 33 MG for the last three targets, respectively. RX J0154.0−5947, RX J0859.1+0537, and RX J1002.2−1925 show evidence for part-time accretion at both magnetic poles, while RX J0953.1+1458 is a polar with a stable one-pole geometry. RX J1002.2−1925 shows large variations in the shapes of its light curves that we associate with an unstable accretion geometry. Nevertheless, it appears to be synchronized. We determined the bolometric soft and hard X-ray fluxes and the luminosities at the Gaia distances of the five stars. Combined with estimates of the cyclotron luminosities, we derived high-state accretion rates that range from Ṁ = 2.9 × 10−11 M⊙ yr−1 to 9.7 × 10−11 M⊙ yr−1 for white dwarf masses between 0.61 and 0.82 M⊙, in agreement with predictions based on the observed effective temperatures of white dwarfs in polars and the theory of compressional heating. Our analysis lends support to the hypothesis that different mean accretion rates appply for the subgroups of short-period polars and nonmagnetic cataclysmic variables.

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Section: Rx J09531+1458 (=J0953) In Leomentioning

confidence: 99%

Neglected X-ray discovered polars

Beuermann

Burwitz

Reinsch

et al. 2021

A&A

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“…J0953 was discovered in the RASS as a soft X-ray source, spectroscopically identified by us as a polar, and is listed as such in Beuermann & Burwitz (1995) and Beuermann et al (1999). The system shows comparatively weak He iiλ4686 line emission and was reclassified by Oliveira et al (2020) as an intermediate polar. We do not share their interpretation and confirm J0953 as a synchronized polar.…”

Section: Rx J09531+1458 (= J0953) In Leomentioning

confidence: 99%

“…The question of a possible asynchronism was raised by Oliveira et al (2020), who considered J0953 as an intermediate polar. Their argument was based on a single double-peaked spectrum, which they interpreted as originating from an accretion disk.…”

Section: Trailed Spectrophotometry and Zeeman Spectroscopymentioning

confidence: 99%

Neglected X-ray discovered polars: III. RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925

Beuermann,

Burwitz,

Reinsch

et al. 2020

Preprint

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We report results on the ROSAT-discovered noneclipsing short-period polars RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925 collected over 30 years. We present accurate linear orbital ephemerides that allow a correct phasing of data taken decades apart. Three of the systems show cyclotron and Zeeman lines that yield magnetic field strengths of 36 MG, 19 MG, and 33 MG for the last three targets, respectively. RX J0154.0-5947, RX J0859.1+0537, and RX J1002.2-1925 show evidence for part-time accretion at both magnetic poles, while RX J0953.1+1458 is a polar with a stable one-pole geometry. RX J1002.2-1925 shows large variations in the shapes of its light curves that we associate with an unstable accretion geometry. Nevertheless, it appears to be synchronized. We determined the bolometric soft and hard X-ray fluxes and the luminosities at the Gaia distances of the five stars. Combined with estimates of the cyclotron luminosities, we derived high-state accretion rates that range from Ṁ = 2.9×10 −11 M ⊙ yr −1 to 9.7×10 −11 M ⊙ yr −1 for white dwarf masses between 0.61 and 0.82 M ⊙ , in agreement with predictions based on the observed effective temperatures of white dwarfs in polars and the theory of compressional heating. Our analysis lends support to the hypothesis that different mean accretion rates appply for the subgroups of short-period polars and nonmagnetic cataclysmic variables.

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“…This source was previously discovered by CRTS (CSS130419 J132918-121622; Drake et al 2014) as an unclassified outbursting star. A spectrum was obtained by Oliveira et al (2020), but it was completely featureless. The spectrum we obtained shows three weak, but significant, He-I emission line, which confirms that this is an AM CVn binary.…”

Section: Ztf19aaktdwcmentioning

confidence: 99%

A Systematic Search for Outbursting AM CVn Systems with the Zwicky Transient Facility

Roestel

Creter

Kupfer

et al. 2021

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AM CVn systems are a rare type of accreting binary that consists of a white dwarf and a helium-rich, degenerate donor star. Using the Zwicky Transient Facility (ZTF), we searched for new AM CVn systems by focusing on blue, outbursting stars. We first selected outbursting stars using the ZTF alerts. We cross matched the candidates with Gaia and Pan-STARRS catalogs. The initial selection of candidates based on the Gaia BP-RP contains 1751 unknown objects. We used the Pan-STARRS g-r and r-i color in combination with the Gaia color to identify 59 strong AM CVn candidates. We obtained identification spectra of 35 sources, of which 18 are high-priority candidates, and discovered nine new AM CVn systems and one magnetic CV that shows only He-II lines. Using the outburst recurrence time, we estimate the orbital periods of the nine new AM CVn systems that are in the range of 29-50 minutes. We conclude that targeted follow up of blue, outbursting sources is an efficient method to find new AM CVn systems and we plan to follow up all candidates we identified to systematically study the population of outbursting AM CVn systems.

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Exploratory Spectroscopy of Magnetic Cataclysmic Variables Candidates and Other Variable Objects. II

Cited by 10 publications

References 61 publications

Neglected X-ray discovered polars

Neglected X-ray discovered polars

Neglected X-ray discovered polars: III. RX J0154.0-5947, RX J0600.5-2709, RX J0859.1+0537, RX J0953.1+1458, and RX J1002.2-1925

A Systematic Search for Outbursting AM CVn Systems with the Zwicky Transient Facility

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