The banana project. III. spin-orbit alignment in the long-period eclipsing binary NY cephei

Simon Albrecht; Joshua N. Winn; Joshua A. Carter; Ignas A.G. Snellen; Ernst J.W. De Mooij

doi:10.1088/0004-637X/726/2/68

The banana project. III. spin-orbit alignment in the long-period eclipsing binary NY cephei

Simon Albrecht^*, Joshua N. Winn, Joshua A. Carter, Ignas A.G. Snellen, Ernst J.W. De Mooij

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on a measurement of the spin-axis orientation of the primary star of the NY Cep system, which is similar to DI Her in many respects: it features two young early-type stars (∼6 Myr, B0.5V+B2V), in an eccentric and relatively long-period orbit (e = 0.48, P = 15^d. 3). The sky projections of the rotation vector and the spin vector are well aligned (βp = 2° ± 4°), in strong contrast to DI Her. Although no convincing explanation has yet been given for the misalignment of DI Her, our results show that the phenomenon is not universal, and that a successful theory will need to account for the different outcome in the case of NY Cep.

Original language	English
Journal	Astrophysical Journal
Volume	726
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/726/2/68
Publication status	Published - 10 Jan 2011
Externally published	Yes

Keywords

Stars: early-type
Stars: formation
Stars: individual (NY Cep)
Stars: kinematics and dynamics
Stars: rotation
Techniques: spectroscopic

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1088/0004-637X/726/2/68

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title = "The banana project. III. spin-orbit alignment in the long-period eclipsing binary NY cephei",

abstract = "Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on a measurement of the spin-axis orientation of the primary star of the NY Cep system, which is similar to DI Her in many respects: it features two young early-type stars (∼6 Myr, B0.5V+B2V), in an eccentric and relatively long-period orbit (e = 0.48, P = 15d. 3). The sky projections of the rotation vector and the spin vector are well aligned (βp = 2° ± 4°), in strong contrast to DI Her. Although no convincing explanation has yet been given for the misalignment of DI Her, our results show that the phenomenon is not universal, and that a successful theory will need to account for the different outcome in the case of NY Cep.",

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author = "Simon Albrecht and Winn, {Joshua N.} and Carter, {Joshua A.} and Snellen, {Ignas A.G.} and {De Mooij}, {Ernst J.W.}",

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AU - Albrecht, Simon

AU - Winn, Joshua N.

AU - Carter, Joshua A.

AU - Snellen, Ignas A.G.

AU - De Mooij, Ernst J.W.

PY - 2011/1/10

Y1 - 2011/1/10

N2 - Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on a measurement of the spin-axis orientation of the primary star of the NY Cep system, which is similar to DI Her in many respects: it features two young early-type stars (∼6 Myr, B0.5V+B2V), in an eccentric and relatively long-period orbit (e = 0.48, P = 15d. 3). The sky projections of the rotation vector and the spin vector are well aligned (βp = 2° ± 4°), in strong contrast to DI Her. Although no convincing explanation has yet been given for the misalignment of DI Her, our results show that the phenomenon is not universal, and that a successful theory will need to account for the different outcome in the case of NY Cep.

AB - Binaries are not always neatly aligned. Previous observations of the DI Her system showed that the spin axes of both stars are highly inclined with respect to one another and the orbital axis. Here, we report on a measurement of the spin-axis orientation of the primary star of the NY Cep system, which is similar to DI Her in many respects: it features two young early-type stars (∼6 Myr, B0.5V+B2V), in an eccentric and relatively long-period orbit (e = 0.48, P = 15d. 3). The sky projections of the rotation vector and the spin vector are well aligned (βp = 2° ± 4°), in strong contrast to DI Her. Although no convincing explanation has yet been given for the misalignment of DI Her, our results show that the phenomenon is not universal, and that a successful theory will need to account for the different outcome in the case of NY Cep.

KW - Stars: early-type

KW - Stars: formation

KW - Stars: individual (NY Cep)

KW - Stars: kinematics and dynamics

KW - Stars: rotation

KW - Techniques: spectroscopic

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VL - 726

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2

ER -

The banana project. III. spin-orbit alignment in the long-period eclipsing binary NY cephei

Abstract

Keywords

ASJC Scopus subject areas

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