English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We report follow-up spectroscopy of 29 cataclysmic variables from the SloanDigital Sky Survey (SDSS), 22 of which were discovered by SDSS and seven otherpreviously known systems that were recovered in SDSS. The periods for 16 ofthese objects were included in the tabulation by Gaensicke et al. (2009). Whilemost of the systems have periods less than 2 hours, only one has a period inthe 80-86 minute 'spike' found by Gaensicke et al. (2009), and 11 have periodslonger than 3 hours, indicating that the present sample is skewed towardlonger-period, higher-luminosity objects. Seven of the objects have spectraresembling dwarf novae, but have apparently never been observed in outburst,suggesting that many cataclysmics with relatively low variability amplituderemain to be discovered. Some of the objects are notable. SDSS J07568+0858 andSDSS J08129+1911 were previously known to have deep eclipses; in addition tospectroscopy, we use archival data from the CRTTS to refine their periods. Wegive a parallax-based distance of 195 (+54, -39) pc for LV Cnc (SDSSJ09197+0857), which at Porb = 81 m has the shortest orbital period in oursample. SDSS J08091+3814 shows both the spectroscopic phase offset andphase-dependent absorption found in SW Sextantis stars. The average spectra ofSDSS J08055+0720 and SDSS J16191+1351 show contributions from K-typesecondaries, and SDSS J080440+0239 shows a contribution from an early M star.We use these to constrain the distances. SDSS J09459+2922 has characteristicstypical of a magnetic system. SDSS11324+6249 may be a novalike variable, and ifso, its orbital period (99 min) is unusually short for that subclass.

Spectroscopic Orbital Periods for 29 Cataclysmic Variables from the Sloan Digital Sky Survey