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Discovery, observations and modelling of a new eclipsing polar: MASTER OT J061451.70-272535.5 | | H. Breytenbach
; D.A.H. Buckley
; P. Hakala
; J.R. Thorstensen
; A. Y. Kniazev
; M. Motsoaledi
; P.A. Woudt
; S.B. Potter
; V. Lipunov
; E. Gorbovskoy
; P. Balanutsa
; N. Tyurina
; | | Date: |
9 Jan 2019 | | Abstract: | We report the discovery of a new eclipsing polar, MASTER OT
J061451.70-272535.5, detected as an optical transient by MASTER auto-detection
software at the recently commissioned MASTER-SAAO telescope. Time resolved
(10-20 s) photometry with the SAAO 1.9-m, and 1.0-m telescopes, utilizing the
SHOC EM-CCD cameras, revealed that the source eclipses, with a period of 2.08
hours (7482.9$pm$3.5$,$s). The eclipse light curve has a peculiar morphology,
comprising an initial dip, where the source brightness drops to ${sim}$50% of
the pre-eclipse level before gradually increasing again in brightness. A second
rapid ingress follows, where the brightness drops by ${sim}$60-80%, followed
by a more gradual decrease to zero flux. We interpret the eclipse profile as
the result of an initial obscuration of the accretion hot-spot on the magnetic
white dwarf by the accretion stream, followed by an eclipse of both the
hot-spot and the partially illuminated stream by the red dwarf donor star. This
is similar to what has been observed in other eclipsing polars such as HU Aqr,
but here the stream absorption is more pronounced. The object was subsequently
observed with South African Large Telescope (SALT) using the Robert Stobie
Spectrograph (RSS). This revealed a spectrum with all of the Balmer lines in
emission, a strong HeII 4686AA{} line with a peak flux greater than that of
H$eta$, as well as weaker HeI lines. The spectral features, along with the
structure of the light curve, suggest that MASTER OT J061451.70-272535.5 is a
new magnetic cataclysmic variable, most likely of the synchronised Polar
subclass. | | Source: | arXiv, 1901.2669 | | Services: | Forum | Review | PDF | Favorites | |
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