MK spectral classifications for southern OB stars

Garrison, R. F.; Hiltner, W. A.; Schild, Rudolph E.

doi:10.1086/190468

Cited by 137 publications

(176 citation statements)

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“…This is the earliest binary in our sample with type O6 III(f) (Garrison et al 1977) and V = 9.23. Four RVs were published and their variability was noted by Feast et al (1963).…”

Section: Hd 130298mentioning

confidence: 83%

New and revised parameters for several southern OB binaries

Mayer

Drechsel

Irrgang

2014

A&A

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Using ESO FEROS archive spectra of several southern OB-type binaries, we derived periods for three SB2 spectroscopic binaries, HD 97166, HD 115455, and HD 123590, and two SB1 systems, HD 130298 and HD 163892. It was also possible to use new FEROS spectra to improve the parameters of the known binaries, KX Vel and HD 167263. For KX Vel, we determined a dynamic mass of the primary of 16.8 M , while the evolutionary model suggests a higher value of 20.2 M . We derived an improved period for HD 167263, and in its spectra, we recognized contributions of both of its interferometric components.

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“…This is the earliest binary in our sample with type O6 III(f) (Garrison et al 1977) and V = 9.23. Four RVs were published and their variability was noted by Feast et al (1963).…”

Section: Hd 130298mentioning

confidence: 83%

New and revised parameters for several southern OB binaries

Mayer

Drechsel

Irrgang

2014

A&A

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“…HD 133518 is a B2-B3 He-strong star (Zboril & North 2000;Groote et al 1980;Garrison et al 1977;MacConnell et al 1970) with narrow lines (v sin i < 30 km s −1 , e.g. Walborn 1983).…”

Section: Hd 133518mentioning

confidence: 99%

Discovery of new magnetic early-B stars within the MiMeS HARPSpol survey

Alécian

Kochukhov

Petit

et al. 2014

A&A

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Context. The Magnetism in Massive Stars (MiMeS) project aims at understanding the origin of the magnetic fields in massive stars as well as their impact on stellar internal structure, evolution, and circumstellar environment. Aims. One of the objectives of the MiMeS project is to provide stringent observational constraints on the magnetic fields of massive stars; however, identification of magnetic massive stars is challenging, as only a few percent of high-mass stars host strong fields detectable with the current instrumentation. Hence, one of the first objectives of the MiMeS project was to search for magnetic objects among a large sample of massive stars, and to build a sub-sample for in-depth follow-up studies required to test the models and theories of fossil field origins, magnetic wind confinement and magnetospheric properties, and magnetic star evolution. Methods. We obtained high-resolution spectropolarimetric observations of a large number of OB stars thanks to three large programs (LP) of observations that have been allocated on the high-resolution spectropolarimeters ESPaDOnS, Narval, and the polarimetric module HARPSpol of the HARPS spectrograph. We report here on the methods and first analysis of the HARPSpol magnetic detections. We identified the magnetic stars using a multi-line analysis technique. Then, when possible, we monitored the new discoveries to derive their rotation periods, which are critical for follow-up and magnetic mapping studies. We also performed a first-look analysis of their spectra and identified obvious spectral anomalies (e.g., surface abundance peculiarities, Hα emission), which are also of interest for future studies. Results. In this paper, we focus on eight of the 11 stars in which we discovered or confirmed a magnetic field from the HARPSpol LP sample (the remaining three were published in a previous paper). Seven of the fields were detected in early-type Bp stars, while the last field was detected in the Ap companion of a normal early B-type star. We report obvious spectral and multiplicity properties, as well as our measurements of their longitudinal field strengths, and their rotation periods when we are able to derive them. We also discuss the presence or absence of Hα emission with respect to the theory of centrifugally-supported magnetospheres.

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“…3.2.2) are typical of a star with B0.5 Ib-a instead of B1 III (Wright et al 2003) or B1 Ib (Garrison et al 1977). There has been a web search on the information presented about the star HD 112364 but it is not presented anywhere as a multiple system.…”

Section: Spectral Classificationmentioning

confidence: 99%

Members of Centaurus OB1 and NGC 4755: new spectroscopic and astrometric studies

Corti

Orellana

2013

A&A

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Context. An OB association is a gravitationally unbound group of stars. The identification of the members of the association is an important aspect of its study. There are few astrometric membership studies for OB associations, but the combination of these studies with astrophysical techniques becomes a very powerful tool for this type of research. Aims. We perform new spectroscopic and astrometric studies of the members of the association Centaurus OB1 (Cen OB1) and the open cluster NGC 4755. Methods. To carry out this study we used new spectroscopic optical observations obtained at CASLEO, and proper motion and photometric data from the Tycho-2 Catalogue and other databases available via the Internet.Results. With this investigation we found 52 members of Cen OB1 (l = 303.• 7, b = 0.• 4) and four members of NGC 4755 (l = 303.• 2, b = 2.• 5), an open cluster integrated into the Cen OB1 stellar association. The distance, heliocentric radial velocity, proper motion, and age of Cen OB1 are 2.6 ± 0.5 kpc, ∼−20 km s −1 , μ α cos δ = −4.78 ± 0.10 mas yr −1 , μ δ = −0.93 ± 0.10 mas yr −1 , and ∼20 × 10 6 years old, respectively. The same parameters found for NGC 4755 are 1.9 ± 0.5 kpc, −18 ± 2 km s −1 , μ α cos δ = −4.14 ± 0.19 mas yr −1 , μ δ = −1.09 ± 0.12 mas yr −1 , and ∼15 × 10 6 years old. The pulsars PSR J1253−5820 and PSR J1254−6150 could have been born as the result of supernovae explosions that occurred in the past by massive members of Cen OB1. We have seen Infrared Astronomical Satellite (IRAS) sources near Cen OB1, that show that star formation is still occurring. The age gradient observed between the different members of Cen OB1 makes it likely that the stellar association and IRAS sources represent different stages of a sequential formation process.

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MK spectral classifications for southern OB stars

Cited by 137 publications

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New and revised parameters for several southern OB binaries

New and revised parameters for several southern OB binaries

Discovery of new magnetic early-B stars within the MiMeS HARPSpol survey

Members of Centaurus OB1 and NGC 4755: new spectroscopic and astrometric studies

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