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J/PASP/98/1133      The open cluster NGC 346                    (Niemela+, 1986)
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The young open cluster NGC 346 in the Small Magellanic Cloud
    NiemelaI V.S., Marraco H.G, Cabanne M.L.
   <Publ. Astron. Soc. Pac. 98, 1133 (1986)>
   =1986PASP...98.1133N      (SIMBAD/NED Reference)
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ADC_Keywords: Magellanic Clouds; Clusters, open; Photometry, CCD
Keywords: open cluster - CCD photometry - radial velocities - O-type stars

Abstract:
    We present CCD photometry and spectrographic observations for stars
    in the open cluster NGC 346, which excites the largest H II region
    in the Small Magellanic Cloud. These observations show that NGC 346
    is an extremely young cluster, containing more than 20 hot O-type
    stars. A radial-velocity study of the brightest stars, and also of
    the nearby supergiant Of star Sk 80, discloses atmospheric expansion
    due to strong stellar winds, but no large-amplitude radial-velocity
    variations due to short-period binary motion. However, two stars
    are probably longer period binaries.

File Summary:
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 FileName       Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             31       58   NGC 346 VRI (Kron-Cousins) CCD photometry
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Byte-by-byte Description of file: table1
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   Bytes Format  Units   Label    Explanations
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   1-  2  I2     ---     Id       Star number
   9- 13  F5.2   mag     Vmag     V magnitude
  16- 20  F5.2   mag     V-R      V-R colour index
  23- 27  F5.2   mag     V-I      V-I colour index
      31  I1     ---     Rem      [1-6]? Remarks (1)
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Note (1): 1: integrated magnitude of a double star, not in Figure 3 and 4.
          2: data correspond only to the brightest member of the group.
          3: V observation affected by a cosmic ray, not in Figures 3 and 4.
          4: red star, not in Figure 4.
          5: integrated magnitude of a double star.
          6: probably non-member, far from cluster center, not in Figure 4.
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Table2 : Spectral classification and absolute magnitudes of the
          brightest stars in NGC 346
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       Star       Spectral    Source   Mv     Remarks
                  Type
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        25        O8.5 III    a,c      -6.6   No. 2 in a
        26        O4 III(f)   a        -7.1   No. 1 in a
        28        O5-6: V:    c        -5.4   Only 1 weak spectrum
        29        O3 III(f)   b,c      -6.1   No. 3 in b
        30        O5-6 V      b,c      -5.9   No. 4 in b
        32        O4-5 V      c        -5.5
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        a: Walborn N.R., 1978, Ap.J. (Letters), 224, L133
        b: Walborn N. R. and Blades J.C., 1986, Ap.J. (Letters), 304, L17
        c: This study.
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Historical Notes: Keupunched at CDS

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(End)                      Marie-Jose Wagner, Patricia Bauer [CDS]   02-Mar-1995