2004A&A...421..991P


C.D.S. - SIMBAD4 rel 1.7 - 2020.11.25CET10:47:40

2004A&A...421..991P - Astronomy and Astrophysics, volume 421, 991-999 (2004/7-3)

Improvements on the fundamental parameters of the open cluster Tombaugh 1 through Washington system photometry.

PIATTI A.E., CLARIA J.J. and AHUMADA A.V.

Abstract (from CDS):

We present CCD photometry in the Washington system C and T1 passbands down to T1∼18.5mag 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'x13.6'. 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+0.1–0.2Gyr. The latter value is in good agreement with that derived from the independent metallicity δT1 index defined in Geisler et al. (1997AJ....114.1920G). An independent metallicity estimation using the [MT1, (C-T1)0] plane with the standard giant branches of Geisler & Sarajedini (1999AJ....117..308G) yields [Fe/H]=-0.30±0.25dex, 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.

Abstract Copyright:

Journal keyword(s): Galaxy: open clusters and associations: individual: Tombaugh 1 - Galaxy: general - techniques: photometric

VizieR on-line data: <Available at CDS (J/A+A/421/991): table1.dat>

Nomenclature: Table 1: Cl* Tombaugh 1 PCA NNNN (Nos 1-1351).

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

CDS comments: In reflist, Turner, JRASC : 1982 is a misprint for 1983.

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 NGC 2194 OpC 06 13 46 +12 49.1   9.03 8.5     ~ 66 1
2 C 0634+094 OpC 06 36 29 +09 28.2     10.9     ~ 77 0
3 V* XZ CMa cC* 07 00 24.8328224100 -20 25 54.131989035     13.01     ~ 26 0
4 C 0658-204 OpC 07 00 29 -20 34.0           ~ 43 0
5 C 0701-207 OpC 07 03 05.0 -20 49 00           ~ 107 0
6 NGC 2324 OpC 07 04 07 +01 02.7   8.83 8.4     ~ 125 0
7 NGC 2627 OpC 08 37 15 -29 57.3     8.4     ~ 47 0
8 NAME CMa Region reg ~ ~           ~ 39 0

    Equat.    Gal    SGal    Ecl

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2020.11.25-10:47:40

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