CCD imagery, uvbyβ Photometry, and the Physical Parameters of Haffner 19
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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional Autónoma de México
2002
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| _version_ | 1876463507288883200 |
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| author | C. Chavarría K. |
| author_facet | C. Chavarría K. |
| contents | CCD imagery, uvbyβ Photometry, and the Physical Parameters of Haffner 19 C. Chavarría K. E. de Lara M. A. Moreno Corral Física, Astronomía y Matemáticas NGC 2467 H II REGIONS HAFFNER 18AB INDIVIDUAL: HAFFNER 19 TECHNIQUES: PHOTOMETRIC We present broad-band UBV(RI)c CCD imagery of 334 stars in the directionof the Galactic cluster Haffner 19. The sample is complete to mλ = 19 (λ =U,B, V,R, I). We reliably establish the cluster membership for 102 stars basedupon their locations in the (V, B−V ), (V, V−I), (I, R−I), (U−B, B−V ), and (V−R, V−I) diagrams, thus increasing three-fold the number of known cluster members.With the Q-method we determine the MK spectral types of the 33 brightest stars,confirming that 29 belong to the clusters young population (15 B0B1 and 14 B2B9 main sequence stars). Complementary uvbyβ photoelectric photometry of 6bright stars independently confirms the distance and reddening to the cluster. Ournarrow-band Hα, [NII], and [S II] imagery reveals the presence of a Strömgrensphere and we derive its properties. From our photometric data and by four differentmeans we find that the best distance estimate to the cluster is 5.2 0.4 kpc, witha fairly homogeneous reddening of EB−V = 0.42 0.01. The data constrain theage of the cluster to be between 106 and ≤ 3.7 106 years, with 2 106 yr as itsmost likely estimate. Because of its young age, it is not possible to derive a reliableestimate for its metallicity. Finally, we present radial velocities of Haffner 18ab,Haffner 19, and NGC2467, which place the last two of these at the same distance. 2002 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57138203 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.2 Vol.38 |
| format | Artículo científico |
| id | redalyc_57138203 |
| institution | Redalyc |
| language | en |
| publishDate | 2002 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | CCD imagery, uvbyβ Photometry, and the Physical Parameters of Haffner 19 C. Chavarría K. Física, Astronomía y Matemáticas NGC 2467 H II REGIONS HAFFNER 18AB INDIVIDUAL: HAFFNER 19 TECHNIQUES: PHOTOMETRIC CCD imagery, uvbyβ Photometry, and the Physical Parameters of Haffner 19 C. Chavarría K. E. de Lara M. A. Moreno Corral Física, Astronomía y Matemáticas NGC 2467 H II REGIONS HAFFNER 18AB INDIVIDUAL: HAFFNER 19 TECHNIQUES: PHOTOMETRIC We present broad-band UBV(RI)c CCD imagery of 334 stars in the directionof the Galactic cluster Haffner 19. The sample is complete to mλ = 19 (λ =U,B, V,R, I). We reliably establish the cluster membership for 102 stars basedupon their locations in the (V, B−V ), (V, V−I), (I, R−I), (U−B, B−V ), and (V−R, V−I) diagrams, thus increasing three-fold the number of known cluster members.With the Q-method we determine the MK spectral types of the 33 brightest stars,confirming that 29 belong to the clusters young population (15 B0B1 and 14 B2B9 main sequence stars). Complementary uvbyβ photoelectric photometry of 6bright stars independently confirms the distance and reddening to the cluster. Ournarrow-band Hα, [NII], and [S II] imagery reveals the presence of a Strömgrensphere and we derive its properties. From our photometric data and by four differentmeans we find that the best distance estimate to the cluster is 5.2 0.4 kpc, witha fairly homogeneous reddening of EB−V = 0.42 0.01. The data constrain theage of the cluster to be between 106 and ≤ 3.7 106 years, with 2 106 yr as itsmost likely estimate. Because of its young age, it is not possible to derive a reliableestimate for its metallicity. Finally, we present radial velocities of Haffner 18ab,Haffner 19, and NGC2467, which place the last two of these at the same distance. 2002 artículo científico 0185-1101 https://www.redalyc.org/articulo.oa?id=57138203 en http://www.redalyc.org/revista.oa?id=571 Revista Mexicana de Astronomía y Astrofísica application/pdf Universidad Nacional Autónoma de México Revista Mexicana de Astronomía y Astrofísica (México) Num.2 Vol.38 |
| title | CCD imagery, uvbyβ Photometry, and the Physical Parameters of Haffner 19 |
| topic | Física, Astronomía y Matemáticas NGC 2467 H II REGIONS HAFFNER 18AB INDIVIDUAL: HAFFNER 19 TECHNIQUES: PHOTOMETRIC |
| url | https://www.redalyc.org/articulo.oa?id=57138203 |