The OB associations LH 101 and LH 104 in the HII region N158 of the LMC

Free access article

Issue		Astron. Astrophys. Suppl. Ser. Volume 130, Number 3, June II 1998


Page(s)		527 - 538
DOI		http://dx.doi.org/10.1051/aas:1998241

DOI: 10.1051/aas:1998241

Astron. Astrophys. Suppl. Ser. 130, 527-538

The OB associations LH 101 and LH 104 in the HII region N158 of the LMC

G. Testor ¹ and V. Niemela ²

Send offprint request: G. Testor (G.Testor@obspm.fr)

1 - Observatoire de Paris, Section de Meudon, F-92195 Meudon Cedex, DAEC, France
2 - Facultad de Ciencias Astronómicas y Geofísicas, Universidad Nacional de La Plata, 1900 La Plata, Argentina

Received October 30, 1997; accepted January 28, 1998

Abstract:

We present photometric and spectroscopic observations of stars in the Large Magellanic Cloud OB associations LH 101 and LH 104, located in the HII region N158, which we have also imaged. From our observations we have constructed upper H-R diagrams for these OB associations, which we find to consist mainly of three populations, one of 2-6 Myr for the stars inside the northern bubble (LH 104), and two populations in the southern HII region (LH 101), one of $\leq$ 2 Myr and the other one aged 3-6 Myr. We have obtained for LH 101 a normal IMF, with a slope of $\Gamma = -1.29$ $\pm$ 0.20 whereas for LH 104 the IMF is flatter with a slope of $\Gamma = -1.05$ $\pm$ 0.12. These IMF slopes are consistent with that of other OB associations in the LMC. Our observations reveal in the region of LH 101 the presence of both unevolved and evolved very massive stars, whose ionizing flux is in excess of that derived from our H $\beta$ images of the HII region. The north-west nebulosity in the region of LH 101 thus appears to be matter bound.

Key words: Magellanic Clouds -- open clusters and associations: individual: LMC-LH 101, LH 104 -- stars: early type -- stars: Wolf-Rayet

SIMBAD Objects

What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.

If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.