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IC 1590, a young cluster embedded in the nebulosity of NGC 281

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dc.creator Guetter, Harry H.
dc.creator Turner, David Gerald, 1945-
dc.date.accessioned 2017-01-13T15:11:38Z
dc.date.available 2017-01-13T15:11:38Z
dc.date.issued 1997-06
dc.identifier.issn 0004-6256
dc.identifier.uri http://library2.smu.ca/handle/01/26731
dc.description Publisher's version/PDF en_CA
dc.description.abstract Photoelectric and CCD photometry (to a limit of V=17.0) is presented for 61 and 243 stars, respectively--a total of 279 individual stars--in and about IC 1590, a young galactic cluster embedded in the nebulosity of NGC 281, the H II region S184. New spectroscopic observations are also presented for 20 stars in or near the cluster. A small amount of differential reddening is observed across the face of IC 1590, and is described by a visual reddening relation of slope E[subscript U-B]/E[subscript B-V]=0.735. From near infrared photometry of bright cluster members in the I and K bands and a variable-extinction analysis of ZAMS members, the value of R = A[subscript V]/E[subscript B-V], the ratio of total to selective absorption, is found to be 3.44[plus or minus]0.07, slightly larger than what has been found for other nearby galactic fields. Most of the cluster reddening appears to originate in dust clouds which are ~0.66 kpc and 2.0-2.2 kpc distant, the latter cloud lying in the immediate foreground of the cluster, which has a derived distance of 2.94[plus or minus]0.15 kpc (V[subscript 0]-M[subscript V] = 12.34[plus or minus]0.11 s.d., [plus or minus]0.03 s.e.). IC 1590 is extremely young and has an estimated age for its 63 identified probable members of 3.5([plus or minus]0.2) × 10[superscript 6] years, with very little evidence for age spread. Its well-defined sequence of 22 gravitationally-contracting stars, the choice of which is supported by star counts and reddening information, provides evidence for the extreme youth of the cluster's central trapezium system, HD 5005. According to the luminosity distribution of likely cluster members, the initial mass function for IC 1590 has a slope of [Gamma] = -1.00[plus or minus]0.21, similar to what has been found for other very young clusters and associations. Given that the photometric study terminates at a magnitude limit marginally brighter than where embedded protostars and T Tauri variables belonging to the cluster are expected to be found, IC 1590 would make an excellent target for Hubble Space Telescope observations. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1086/118423
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Galaxies -- Clusters
dc.subject.lcsh Cepheids
dc.subject.lcsh Astronomical photometry
dc.title IC 1590, a young cluster embedded in the nebulosity of NGC 281 en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astronomical Journal 113(6), 2116-2129. (1997) en_CA

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