2009
DOI: 10.1002/asna.200911207
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Photometric study of the OB star clusters NGC 1502 and NGC 2169 and mass estimation of their members at the University Observatory Jena

Abstract: In this work we present detailed photometric results of the trapezium like galactic nearby OB clusters NGC 1502 and NGC 2169 carried out at the University Observatory Jena. We determined absolute BVRI magnitudes of the mostly resolved components using Landolt standard stars. This multi colour photometry enables us to estimate spectral type and absorption as well as the masses of the components, which were not available for most of the cluster members in the literature so far, using models of stellar evolution.… Show more

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Cited by 6 publications
(9 citation statements)
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“…We use a general error of 1% for the B and V magnitudes (Simbad and Hipparcos). The calculation of the bolometric corrections from the spectral types and the extinction (A V ) due to the interstellar medium follows the procedure in Hohle et al (2009) using the bolometric corrections and the intrinsic colour indices from Bessell et al (1998), Kenyon &Hartmann (1995), andSchmidt-Kaler (1982). For the spectral types M4-6, we cannot use Bessell et al (1998), which goes down to 3500 K only, so that we use only Kenyon & Hartmann (1995) and Schmidt-Kaler (1982) for these stars.…”
Section: Colours and Extinctionmentioning
confidence: 99%
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“…We use a general error of 1% for the B and V magnitudes (Simbad and Hipparcos). The calculation of the bolometric corrections from the spectral types and the extinction (A V ) due to the interstellar medium follows the procedure in Hohle et al (2009) using the bolometric corrections and the intrinsic colour indices from Bessell et al (1998), Kenyon &Hartmann (1995), andSchmidt-Kaler (1982). For the spectral types M4-6, we cannot use Bessell et al (1998), which goes down to 3500 K only, so that we use only Kenyon & Hartmann (1995) and Schmidt-Kaler (1982) for these stars.…”
Section: Colours and Extinctionmentioning
confidence: 99%
“…We estimated the BJHK magnitudes of the components from the BVJHK magnitudes and the spectral types of the unresolved system listed in 2MASS and/or Simbad using the resolved V magnitudes and spectral types given in the catalogues of both components with a procedure as in Hohle et al (2009).…”
Section: Colours and Extinctionmentioning
confidence: 99%
“…As noted in Section 2, NGC 1502-1 = ADS 2948A = NSV 1458 was claimed to be variable by Guthnick and Prager (1930). The star has a spectral type of B0 II-III (Morgan et al 1955) and is known to have variable radial velocity (Plaskett 1924, Lorenz et al 1998, Hohle et al 2009. Unfortunately, the photometric variability of NGC 1502-1 (Fig.…”
Section: Other Variablesmentioning
confidence: 97%
“…As pointed out in Section 1, the U BV photometry of NGC 1502 was provided by many authors, but except for Hohle et al (2009), no I C photometry has been made so far. In order to obtain standard (V − I C ) colors, we carried out V I C observations of NGC 1502 together with the Landolt (1992) field PG 0918+029 on a single clear night of April 20, 2005.…”
Section: U Bv I C Photometrymentioning
confidence: 99%
“…We use a general error of 1% for the B and V magnitudes (Simbad and Hipparcos). The calculation of the bolometric corrections from the spectral types and the extinction (A V ) due to the interstellar medium follows the procedure in Hohle et al (2009) using the bolometric corrections and the intrinsic colour indices from Bessell et al (1998), Kenyon & Hartmann (1995) and Schmidt-Kaler (1982). For the spectral types M4-6, we cannot use Bessell…”
Section: Colours and Extinctionmentioning
confidence: 99%