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HD 120578


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The origin of massive O-type field stars. I. A search for clusters
We present a study aimed at clarifying the birthplace for 43 massiveO-type field stars. In this first paper we present the observationalpart: a search for stellar clusters near the target stars. We derivestellar density maps at two different resolving scales, viz. ˜0.25pc and ˜1.0 pc from NTT and TNG imaging and the 2MASS catalogue.These scales are typical for cluster sizes. The main result is that thelarge majority of the O-type field population are isolated stars: only12% (5 out of 43) of the O-type field stars is found to harbour asmall-scale stellar cluster. We review the literature and aim atcharacterizing the stellar field of each O-type field star with theemphasis on star formation and the presence of known young stellarclusters. An analysis of the result of this paper and a discussion ofthe O-type field population as products of a dynamical ejection event ispresented in an accompanying paper.Based on observations collected at the European Southern Observatory,Chile, and at the Italian Telescopio Nazionale Galileo (TNG) operated onthe island of La Palma by the Centro Galileo Galilei of the CNAA(Consorzio Nazionale per l'Astronomia e l'Astrofisica) at the SpanishObservatorio del Roque de los Muchachos of the Instituto de Astrofisicade Canarias.Table 2 and Figs. 4 to 17 are available in electronic form athttp://www.edpsciences.org

Broad-band photometry of selected southern ultraviolet-bright stars.
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A spectral survey of the southern Milky Way 1 : general description and catalogue 1 (l=306 -318 degrees).
Abstract image available at:http://adsabs.harvard.edu/cgi-bin/nph-bib_query?1974A&AS...16..445S&db_key=AST

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Observation and Astrometry data

Constellation:Centaurus
Right ascension:13h52m22.08s
Declination:-62°46'29.8"
Apparent magnitude:7.995
Distance:337.838 parsecs
Proper motion RA:-9.5
Proper motion Dec:-3.9
B-T magnitude:8.002
V-T magnitude:7.996

Catalogs and designations:
Proper Names
HD 1989HD 120578
TYCHO-2 2000TYC 9008-292-1
USNO-A2.0USNO-A2 0225-18363300
HIPHIP 67720

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