INVESTIGADORES
PIATTI Andres Eduardo
artículos
Título:
On the stellar content of the open clusters Melotte 105, Hogg 15, Pismis 21 and Ruprecht 140
Autor/es:
PIATTI, ANDRÉS E.; CLARIA OLMEDO, JUAN JOSÉ
Revista:
ASTRONOMY AND ASTROPHYSICS
Referencias:
Año: 2001 vol. 370 p. 931 - 938
ISSN:
0004-6361
Resumen:
CCD observations in the B, V and I passbands have been used to generate
colour-magnitude diagrams reaching down to V ~ 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 4arcmin x4arcmin . 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 +/- 0.03 and 0.95 +/- 0.05,
respectively. Their distances to the Sun have been estimated as 2.2 +/-
0.3 and 2.6 +/- 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. Tables 2 to 5 are only available in electronic form at the CDS via
anonymous ftp to cdsarc.u-strasbg.fr (130.793.128.5) or via
http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/370/931