[vsnet-alert 15832] (fwd) PNV J19150199+0719471: Orbital Period

[Taichi Kato]

From: Juan <jer at astro.unam.mx>
Subject: PNV J19150199+0719471: Orbital Period
Date: 12 June 2013 10:03:55 CDT

Hello,

We conducted Echelle observations of PNV Aql on June 3 during 2.5 
hours with the 2.1m telescope
at the San Pedro M=E1rtir Observatory.
We detected a strong double-peaked H alfa line in emission, while H 
Beta shows a
broad and shallow abosrption with a weak core in emission. H Gamma and 
Delta are almost absent.
He I 4471 shows a weak absorption.

Radial velocities of H alfa shows a clear orbital period of P(orb) 
0.06164 days. The semi amplitude of the
radial velocity curve is only K = 15 km/s, which for a high
inclination system (as presumed by the double peak  H alfa line)
suggests a very low mass companion, possibly a brown dwarf. If this 
proves correct we should be able
to observe the Balmer lines of the white dwarf when it returns to 
quiescence.

Dr. Juan Echevarria

The following observers and colleagues have contributed to these 
observations: Gonzalez-Buitrago, Olivares and Rafael Costero