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Abstract:

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.

Registro:

Documento: Artículo
Título:Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry
Autor:Piatti, A.E.; Clariá, J.J.; Ahumada, A.V.
Filiación:Inst. de Astronomia/Fis. del Espacio, CC 67, Suc. 28, 1428, Buenos Aires, Argentina
Observatorio Astronómico, Univ. Nacional de Córdoba, Laprida 854, 5000 Cordoba, Argentina
Palabras clave: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
Año:2004
Volumen:421
Número:3
Página de inicio:991
Página de fin:999
DOI: http://dx.doi.org/10.1051/0004-6361:20047036
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_v421_n3_p991_Piatti

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Citas:

---------- APA ----------
Piatti, A.E., Clariá, J.J. & Ahumada, A.V. (2004) . Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry. Astronomy and Astrophysics, 421(3), 991-999.
http://dx.doi.org/10.1051/0004-6361:20047036
---------- CHICAGO ----------
Piatti, A.E., Clariá, J.J., Ahumada, A.V. "Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry" . Astronomy and Astrophysics 421, no. 3 (2004) : 991-999.
http://dx.doi.org/10.1051/0004-6361:20047036
---------- MLA ----------
Piatti, A.E., Clariá, J.J., Ahumada, A.V. "Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry" . Astronomy and Astrophysics, vol. 421, no. 3, 2004, pp. 991-999.
http://dx.doi.org/10.1051/0004-6361:20047036
---------- VANCOUVER ----------
Piatti, A.E., Clariá, J.J., Ahumada, A.V. Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry. Astron. Astrophys. 2004;421(3):991-999.
http://dx.doi.org/10.1051/0004-6361:20047036