SIMBAD references

2002A&A...395..499R - Astronomy and Astrophysics, volume 395, 499-513 (2002/11-4)

An XMM-Newton observation of the Lagoon Nebula and the very young open cluster NGC 6530.

RAUW G., NAZE Y., GOSSET E., STEVENS I.R., BLOMME R., CORCORAN M.F., PITTARD J.M. and RUNACRES M.C.

Abstract (from CDS):

We report the results of an XMM-Newton observation of the Lagoon Nebula (M8). Our EPIC images of this region reveal a cluster of point sources, most of which have optical counterparts inside the very young open cluster NGC 6530. The bulk of these X-ray sources are probably associated with low and intermediate mass pre-main sequence stars. One of the sources experienced a flare-like increase of its X-ray flux making it the second brightest source in M8 after the O4 star 9 Sgr. The X-ray spectra of most of the brightest sources can be fitted with thermal plasma models with temperatures of kT ∼ a few keV. Only a few of the X-ray selected PMS candidates are known to display Hα emission and were previously classified as classical TTauri stars. This suggests that most of the X-ray emitting PMS stars in NGC 6530 are weak-line TTauri stars. In addition to 9 Sgr, our EPIC field of view contains also a few early-type stars. The X-ray emission from HD 164816 is found to be typical for an O9.5III-IV star. At least one of the known Herbig Be stars in NGC 6530 (LkHα115) exhibits a relatively strong X-ray emission, while most of the main sequence stars of spectral type B1 and later are not detected. We also detect (probably) diffuse X-ray emission from the Hourglass Region that might reveal a hot bubble blown by the stellar wind of Herschel 36, the ionizing star of the Hourglass Region.

Abstract Copyright:

Journal keyword(s): ISM: individual objects: M 8 - open clusters and associations: individual: NGC 6530 - stars: early-type - stars: pre-main sequence - X-rays: stars

VizieR on-line data: <Available at CDS (J/A+A/395/499): table1.dat table2.dat table3.dat>

Nomenclature: Tables 1, 2, 3: [RNG2002] NNN (Nos 1-117).

Simbad objects: 173

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