SIMBAD references

2000A&A...359..227H - Astronomy and Astrophysics, volume 359, 227-241 (2000/7-1)

X-ray emission from Lindroos binary systems.


Abstract (from CDS):

We present a study of the X-ray emission from binary systems extracted from the Lindroos catalogue (Lindroos, 1986A&A...156..223L) based on the ROSAT All-Sky survey as well as ROSAT PSPC and HRI pointings. The studied sample consists of visual binary systems comprised of early-type primaries and late-type secondaries. The ages of the systems were determined by Lindroos (1985A&AS...60..183L) from uvbyβ photometry of the primaries. These ages range between 33 and 135Myr, so if the late-type secondaries are physically bound to the early-type primaries, they could be Post-T Tauri stars (PTTS). We have found strong X-ray emission from several secondaries. This fact together with their optical and IR data, make them bona fide PTTS candidates. We have also detected X-ray emission from several early-type primaries and, in particular, from most of the late-B type stars. Because their HRI hardness ratios are similar to those from resolved late-type stars, the presence of an unresolved late-type companion seems to be the cause of this emission.

Abstract Copyright:

Journal keyword(s): stars: binaries: visual - stars: early-type - stars: pre-main sequence - stars: individual: HR 4796 - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/359/227): table1.dat table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat>

Status at CDS:   All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 42

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