On the stellar content of the open clusters Melotte 105, Hogg 15, Pismis 21 and Ruprecht 140

Free access article

Issue		A&A Volume 370, Number 3, May II 2001


Page(s)		931 - 938
Section		Stellar clusters and associations
DOI		http://dx.doi.org/10.1051/0004-6361:20010268

A&A 370, 931-938 (2001)
DOI: 10.1051/0004-6361:20010268

On the stellar content of the open clusters Melotte 105, Hogg 15, Pismis 21 and Ruprecht 140

A. E. Piatti and J. J. Clariá

Observatorio Astronómico, Laprida 854, 5000 Córdoba, Argentina

(Received 28 November 2000 / Accepted 30 January 2001 )

Abstract
CCD observations in the B, V and I passbands have been used to generate colour-magnitude diagrams reaching down to $V \sim 19$ mag for two slightly characterized (Melotte 105 and Hogg 15) and two almost unstudied (Pismis 21 and Ruprecht 140) open clusters. The sample consists of about 1300 stars observed in fields of about 4 $\arcmin$ $\times$ 4 $\arcmin$ . Our analysis shows that neither Pismis 21 nor Ruprecht 140 are genuine open clusters since no clear main sequences or other meaningful features can be seen in their colour-magnitude diagrams. Melotte 105 and Hogg 15 are open clusters affected by $E(B-V) = 0.42 \pm 0.03$ and 0.95 $\pm$ 0.05, respectively. Their distances to the Sun have been estimated as 2.2 $\pm$ 0.3 and 2.6 $\pm$ 0.08 kpc, respectively, while the corresponding ages estimated from empirical isochrones fitted to the Main Sequence cluster members are ~350 Myr and 300 Myr, respectively. The present data are not consistent with the membership of the WN6 star HDE 311884 to Hogg 15.

Key words: open clusters: individual: Melotte 105, Hogg 15, Pismis 21, Ruprecht 140 -- open clusters: general -- techniques: photometric

Offprint request: A. E. Piatti, andres@mail.oac.uncor.edu

SIMBAD Objects
Tables at the CDS

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.