[vsnet-alert 17451] V418 Ser: another EI Psc-type object (ATEL)
tkato at kusastro.kyoto-u.ac.jp
Fri Jul 4 17:42:39 JST 2014
V418 Ser: another EI Psc-type object (ATEL)
(Please note that some of our recent papers have "special"
journal page numbers. VSNET paper is PASJ 56, S1, where "S"
is for special volume. Pdot paper is PASJ 61, S395.
An omission of "S" refers to a different paper, and ADS
fails to provide a link to the proper reference)
ATEL #6287 ATEL #6287
Title: V418 Ser: A Sub-Period Minimum CV With Hydrogen
Author: P. Garnavich, C. Littlefield (Notre Dame), D. Terndrup and
S. Adams (Ohio State)
Queries: pgarnavi at nd.edu
Posted: 3 Jul 2014; 16:43 UT
Subjects:Optical, Cataclysmic Variable
We obtained spectra of the cataclysmic variable V418 Ser,
which was recently found by the VSNET collaboration
(Kato et al. 2004, PASJ, 56, 1) to have an orbit
shorter than the period minimum for hydrogen-rich
CVs (Littlefield, VSNET-alert 17321; de Miguel, VSNET-alert 17322).
The spectrum was taken with the Large Binocular
Telescope (LBT) and MODS spectrograph on 2014 June 30,
and covers wavelengths from 320 nm to 1 micron. The
spectrum shows doubled peaked emission lines characteristic
of a quiescent accretion disk. Hydrogen is clearly present
indicating that this is not an AM CVn star, but the
Helium to Hydrogen ratio is large when compared with long
Overall the spectrum is very similar to the short period
system SBS 1108+574 (CSS 120422:111127+571239; Littlefield
et al. 2013, AJ, 145, 145; Carter et al. 2013, MNRAS, 431, 372)
making V418 Ser a new member of a small but growing number of
sub-period minimum binaries accreting some hydrogen.
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