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Abstract:

We present the results of CCD BVI Johnson-Cousins photometry down to V ∼ 19 mag in the regions of the unstudied stellar groups Pismis 23 and BH 222, both projected close to the direction towards the Galactic centre. We measured V magnitude and B - V and V - I colours for a total of 928 stars in fields of about 4′ × 4′. Pismis 23 is conclusively a physical system, since a clear main sequence and other meaningful features can be seen in the colour-magnitude diagrams. The reality of this cluster is also supported by star counts carried out within and outside the cluster field. For Pismis 23 we derive colour excesses E(B-V) = 2.0 ± 0.1 and E(V-I) = 2.6 ± 0.1, a distance from the Sun of 2.6 ± 0.6 kpc (Z = -19 pc) and an age of 300 ± 100 Myr (assuming solar metal content). BH222 appears to be young open cluster formed by a vertical main sequence and by a conspicuous group of luminous, typically red supergiant stars. We derived for this cluster a colour excess of E(V-I) = 2.4 ± 0.2, a distance from the Sun of 6.0 ± 2.7 kpc (Z = -46 pc) and an age of 60 ± 30 Myr. The resulting reddening and distance estimates place these two young objects among the most reddened and distance open clusters known in the direction towards the Galactic centre. They are located beyond the Sagittarius arm, close to the direction where this arm probably bifurcates into two arms.

Registro:

Documento: Artículo
Título:Two highly reddened young open clusters located beyond the Sagittarius arm
Autor:Piatti, A.E.; Clariá, J.J.
Filiación:Instituto de Astronomía y Física del Espacio, CC 67, Suc. 28, 1428, Buenos Aires, Argentina
Observatorio Astronómico, Universidad Nacional de Córdoba, Laprida 854, 5000 Córdoba, Argentina
Palabras clave:Open clusters and associations: general; Open clusters and associations: individual: Pismis 23, BH 222; Techniques: photometric; Bifurcation (mathematics); Charge coupled devices; Distance measurement; Galaxies; Photometry; Sun; Colour-magnitude diagrams; Galactic centre; Johnson-Cousins photometry; Open clusters; Pismis 23; Sagittarius arm; Astrophysics
Año:2002
Volumen:388
Número:1
Página de inicio:179
Página de fin:188
DOI: http://dx.doi.org/10.1051/0004-6361:20020540
Título revista:Astronomy and Astrophysics
Título revista abreviado:Astron. Astrophys.
ISSN:00046361
CODEN:AAEJA
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v388_n1_p179_Piatti

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Citas:

---------- APA ----------
Piatti, A.E. & Clariá, J.J. (2002) . Two highly reddened young open clusters located beyond the Sagittarius arm. Astronomy and Astrophysics, 388(1), 179-188.
http://dx.doi.org/10.1051/0004-6361:20020540
---------- CHICAGO ----------
Piatti, A.E., Clariá, J.J. "Two highly reddened young open clusters located beyond the Sagittarius arm" . Astronomy and Astrophysics 388, no. 1 (2002) : 179-188.
http://dx.doi.org/10.1051/0004-6361:20020540
---------- MLA ----------
Piatti, A.E., Clariá, J.J. "Two highly reddened young open clusters located beyond the Sagittarius arm" . Astronomy and Astrophysics, vol. 388, no. 1, 2002, pp. 179-188.
http://dx.doi.org/10.1051/0004-6361:20020540
---------- VANCOUVER ----------
Piatti, A.E., Clariá, J.J. Two highly reddened young open clusters located beyond the Sagittarius arm. Astron. Astrophys. 2002;388(1):179-188.
http://dx.doi.org/10.1051/0004-6361:20020540