Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry
We present CCD photometry in the Washington system C and T1 passbands down to T1 ∼ 18.5 mag in the field of Tombaugh 1, a little studied open cluster located in the third Galactic quadrant. We measured T1 magnitudes and C-T1 colours for a total of 1351 stars distributed throughout an area of 13′.6 ×...
Guardado en:
| Publicado: |
2004
|
|---|---|
| Materias: | |
| Acceso en línea: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v421_n3_p991_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v421_n3_p991_Piatti |
| Aporte de: |
| id |
paper:paper_00046361_v421_n3_p991_Piatti |
|---|---|
| record_format |
dspace |
| spelling |
paper:paper_00046361_v421_n3_p991_Piatti2023-06-08T14:27:34Z Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Charge coupled devices Color Galaxies Observatories Photometry Radiation detectors Galactic coordinates Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Astrophysics We present CCD photometry in the Washington system C and T1 passbands down to T1 ∼ 18.5 mag in the field of Tombaugh 1, a little studied open cluster located in the third Galactic quadrant. We measured T1 magnitudes and C-T1 colours for a total of 1351 stars distributed throughout an area of 13′.6 × 13′.6. A cluster radius of 4′.3 ± 0′.3 was estimated from star counts in 100-pixel a side boxes distributed throughout the entire observed field. Based on the best fits of isochrones computed by the Geneva group for Z = 0.008 to the T1 vs. C - T1 colour-magnitude diagram, we derive a colour excess E(C - T1) = 0.55 ± 0.10, equivalent to E(B - V) = 0.30 ± 0.05, a distance of (2.2 ± 0.5) kpc from the Sun and an age of 1.3-0.2 +0.1 Gyr. The latter value is in good agreement with that derived from the independent metallicity δT 1 index defined in Geisler et al. (1997, AJ, 114, 1920). An independent metallicity estimation using the [MT1,, (C - T 1)0] plane with the standard giant branches of Geisler & Sarajedini (1999, AJ, 117, 308) yields [Fe/H] = -0.30 ± 0.25 dex, a value which lends support to the one obtained from the isochrone fit. Tombaugh 1 is then found to be a relatively metal-poor intermediate-age open cluster. 2004 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v421_n3_p991_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v421_n3_p991_Piatti |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Charge coupled devices Color Galaxies Observatories Photometry Radiation detectors Galactic coordinates Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Astrophysics |
| spellingShingle |
Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Charge coupled devices Color Galaxies Observatories Photometry Radiation detectors Galactic coordinates Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Astrophysics Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry |
| topic_facet |
Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Charge coupled devices Color Galaxies Observatories Photometry Radiation detectors Galactic coordinates Galaxy: general Galaxy: open clusters and associations: individual: Tombaugh 1 Techniques: photometric Astrophysics |
| description |
We present CCD photometry in the Washington system C and T1 passbands down to T1 ∼ 18.5 mag in the field of Tombaugh 1, a little studied open cluster located in the third Galactic quadrant. We measured T1 magnitudes and C-T1 colours for a total of 1351 stars distributed throughout an area of 13′.6 × 13′.6. A cluster radius of 4′.3 ± 0′.3 was estimated from star counts in 100-pixel a side boxes distributed throughout the entire observed field. Based on the best fits of isochrones computed by the Geneva group for Z = 0.008 to the T1 vs. C - T1 colour-magnitude diagram, we derive a colour excess E(C - T1) = 0.55 ± 0.10, equivalent to E(B - V) = 0.30 ± 0.05, a distance of (2.2 ± 0.5) kpc from the Sun and an age of 1.3-0.2 +0.1 Gyr. The latter value is in good agreement with that derived from the independent metallicity δT 1 index defined in Geisler et al. (1997, AJ, 114, 1920). An independent metallicity estimation using the [MT1,, (C - T 1)0] plane with the standard giant branches of Geisler & Sarajedini (1999, AJ, 117, 308) yields [Fe/H] = -0.30 ± 0.25 dex, a value which lends support to the one obtained from the isochrone fit. Tombaugh 1 is then found to be a relatively metal-poor intermediate-age open cluster. |
| title |
Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry |
| title_short |
Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry |
| title_full |
Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry |
| title_fullStr |
Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry |
| title_full_unstemmed |
Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry |
| title_sort |
improvements on the fundamental parameters of the open cluster tombaugh 1 through washington system photometry |
| publishDate |
2004 |
| url |
https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v421_n3_p991_Piatti http://hdl.handle.net/20.500.12110/paper_00046361_v421_n3_p991_Piatti |
| _version_ |
1768542670688354304 |