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:
| Autores principales: | , , |
|---|---|
| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_00046361_v421_n3_p991_Piatti |
| Aporte de: |
| id |
todo:paper_00046361_v421_n3_p991_Piatti |
|---|---|
| record_format |
dspace |
| spelling |
todo:paper_00046361_v421_n3_p991_Piatti2023-10-03T14:00:07Z Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry Piatti, A.E. Clariá, J.J. Ahumada, A.V. 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. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar 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 Piatti, A.E. Clariá, J.J. Ahumada, A.V. 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. |
| format |
JOUR |
| author |
Piatti, A.E. Clariá, J.J. Ahumada, A.V. |
| author_facet |
Piatti, A.E. Clariá, J.J. Ahumada, A.V. |
| author_sort |
Piatti, A.E. |
| 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 |
| url |
http://hdl.handle.net/20.500.12110/paper_00046361_v421_n3_p991_Piatti |
| work_keys_str_mv |
AT piattiae improvementsonthefundamentalparametersoftheopenclustertombaugh1throughwashingtonsystemphotometry AT clariajj improvementsonthefundamentalparametersoftheopenclustertombaugh1throughwashingtonsystemphotometry AT ahumadaav improvementsonthefundamentalparametersoftheopenclustertombaugh1throughwashingtonsystemphotometry |
| _version_ |
1807314398804443136 |