MY Camelopardalis, a very massive merger progenitor

Lorenzo, Javier; Negueruela, I.; Baker, A. K. F. Val; García, M.; Simón‐Díaz, S.; Pástor, P.; Majuelos, Méndez

doi:10.1051/0004-6361/201424345

Cited by 15 publications

(14 citation statements)

References 53 publications

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“…MY Cam A = BD + 56 864 A = ALS 7836 A. SB2E+Cas (previously SB2E). Lorenzo et al (2014) classified this extremely fast and short-period eclipsing binary as O5.5 V + O7 V. In GOSSS III we obtained a similar classification of O5.5 V(n) + O6.5 V(n) which we refine here to O5.5 Vnz + O6.5 Vnz with a lucky spectroscopy observation. Using a LiLiMaRlin epoch we classify the system as O6 V(n) + O6.5 V(n)z.…”

Section: Cepheus-camelopardalissupporting

confidence: 67%

MONOS: Multiplicity Of Northern O-type Spectroscopic systems

Apellániz

Paez

Negueruela

et al. 2019

A&A

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Context. Multiplicity in massive stars is key to understanding the chemical and dynamical evolution of galaxies. Among massive stars, those of O type play a crucial role due to their high masses and short lifetimes. Aims. MONOS (Multiplicity Of Northern O-type Spectroscopic systems) is a project designed to collect information and study O-type spectroscopic binaries with δ > −20 • . In this first paper we describe the sample and provide spectral classifications and additional information for objects with previous spectroscopic and/or eclipsing binary orbits. In future papers we will test the validity of previous solutions and calculate new spectroscopic orbits. Methods. The spectra in this paper have two sources: the Galactic O-Star Spectroscopic Survey (GOSSS), a project that obtains blueviolet R ∼ 2500 spectroscopy of thousands of massive stars, and LiLiMaRlin, a library of libraries of high-resolution spectroscopy of massive stars obtained from four different surveys (CAFÉ-BEANS, OWN, IACOB, and NoMaDS) and additional data from our own observing programs and public archives. We have also used lucky images obtained with AstraLux. Results. We present homogeneous spectral classifications for 92 O-type spectroscopic multiple systems and ten optical companions, many of them original. We discuss the visual multiplicity of each system with the support of AstraLux images and additional sources. For eleven O-type objects and for six B-type objects we present their first GOSSS spectral classifications. For two known eclipsing binaries we detect double absorption lines (SB2) or a single moving line (SB1) for the first time, to which we add a third system reported by us recently. For two previous SB1 systems we detect their SB2 nature for the first time and give their first separate spectral classifications, something we have also done for a third object just recently identified as a SB2. We also detect nine new astrometric companions and provide updated information on several others. We emphasize the results for two stars: for σ Ori AaAbB we provide spectral classifications for the three components with a single observation for the first time thanks to a lucky spectroscopy observation obtained close to the Aa,Ab periastron and for θ 1 Ori CaCb we add it to the class of Galactic Of?p stars, raising the number of its members to six. Our sample of O-type spectroscopic binaries contains more triple-or higher-order systems than double systems.

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Section: Cepheus-camelopardalissupporting

confidence: 67%

MONOS: Multiplicity Of Northern O-type Spectroscopic systems

Apellániz

Paez

Negueruela

et al. 2019

A&A

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“…This is the second of the two bright stars in the open cluster Alicante1. Hiltner & Johnson (1956) classified it as O6nn and Lorenzo et al (2014) discovered it is an overcontact binary composed of two O stars with a period of 1.1754514days. In the GOSSS data the two components are separated by a Dv of ∼500 km s −1 and we assign them spectral types O5.5V(n)+O6.5V(n).…”

Section: New Systems In Gosssmentioning

confidence: 99%

The Galactic O-Star Spectroscopic Survey (Gosss). Iii. 142 Additional O-Type Systems*

Apellániz

Sota

Arias

et al. 2016

ApJS

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133

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This is the third installment of theGalactic O-Star Spectroscopic Survey (GOSSS), a massive spectroscopic survey of Galactic O stars, based on new homogeneous, high signal-to-noise ratio, R∼2500 digital observations selected from the Galactic O-Star Catalog. In this paper, we present 142 additional stellar systems with O stars from both hemispheres, bringing the total of O-type systems published within the project to 590. Among the new objects, there are 20 new O stars. We also identify 11 new double-lined spectroscopic binaries, 6of whichare of O+O type and 5 of O+B type, and an additional new tripled-lined spectroscopic binary of O+O+B type. We also revise some of the previous GOSSS classifications, present some egregious examples of stars erroneously classified as O-type in the past, introduce the use of luminosity class IV at spectral types O4-O5.5, and adapt the classification scheme to the work of Arias et al.

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“…Yaşarsoy &Yakut 2013 andZhao et al 2014, respectively). Among the best-studied systems hosting O-type stars are HD 100 213 (= TU Mus, Linder et al 2007), VFTS 352 (Almeida et al 2015), and MY Cam (= BD+56°864, Lorenzo et al 2014). Lorenzo et al (2014) and Almeida et al (2015) note that the components of MY Cam and VFTS 352 appear hotter than one would expect from their masses.…”

Section: Discussionmentioning

confidence: 99%

“…Our analysis of the light curve of LSS 3074 indicates that this system is a candidate for an overcontact binary. Massive overcontact binaries are important objects as they could be progenitors of merger events or of binary black hole systems (Lorenzo et al 2014, Almeida et al 2015). Yet, only a handful of such systems are known and sometimes the exact configuration (double contact versus semidetached) is controversial (e.g.…”

Section: Discussionmentioning

confidence: 99%

Observational signatures of past mass-exchange episodes in massive binaries: the case of LSS 3074

Raucq

Gosset

Rauw

et al. 2017

A&A

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Context. The role of mass and momentum exchanges in close massive binaries is very important in the subsequent evolution of the components. Such exchanges produce several observational signatures such as asynchronous rotation and altered chemical compositions, that remain after the stars detach again. Aims. We investigated these effects for the close O-star binary LSS 3074 (O4 f + O6-7 :(f):), which is a good candidate for a past Roche lobe overflow (RLOF) episode because of its very short orbital period, P = 2.185 days, and the luminosity classes of both components. Methods. We determined a new orbital solution for the system. We studied the photometric light curves to determine the inclination of the orbit and Roche lobe filling factors of both stars. Using phase-resolved spectroscopy, we performed the disentangling of the optical spectra of the two stars. We then analysed the reconstructed primary and secondary spectra with the CMFGEN model atmosphere code to determine stellar parameters, such as the effective temperatures and surface gravities, and to constrain the chemical composition of the components. Results. We confirm the apparent low stellar masses and radii reported in previous studies. We also find a strong overabundance in nitrogen and a strong carbon and oxygen depletion in both primary and secondary atmospheres, together with a strong enrichment in helium of the primary star. Conclusions. We propose several possible evolutionary pathways through a RLOF process to explain the current parameters of the system. We confirm that the system is apparently in overcontact configuration and has lost a significant portion of its mass to its surroundings. We suggest that some of the discrepancies between the spectroscopic and photometric properties of LSS 3074 could stem from the impact of a strong radiation pressure of the primary.

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MY Camelopardalis, a very massive merger progenitor

Cited by 15 publications

References 53 publications

MONOS: Multiplicity Of Northern O-type Spectroscopic systems

MONOS: Multiplicity Of Northern O-type Spectroscopic systems

The Galactic O-Star Spectroscopic Survey (Gosss). Iii. 142 Additional O-Type Systems*

Observational signatures of past mass-exchange episodes in massive binaries: the case of LSS 3074

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