A Spectroscopic Orbit for the Late-type Be Star beta CMi

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10369295" target="_blank" >RIV/00216208:11320/17:10369295 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.3847/1538-4357/836/1/112" target="_blank" >http://dx.doi.org/10.3847/1538-4357/836/1/112</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3847/1538-4357/836/1/112" target="_blank" >10.3847/1538-4357/836/1/112</a>

Result language

angličtina

Original language name

A Spectroscopic Orbit for the Late-type Be Star beta CMi

Original language description

The late-type Be star beta CMi is remarkably stable compared to other Be stars that have been studied. This has led to a realistic model of the outflowing Be disk by Klement et al. These results showed that the disk is likely truncated at a finite radius from the star, which Klement et al. suggest is evidence for an unseen binary companion in orbit. Here we report on an analysis of the Ritter Observatory spectroscopic archive of a CMi to search for evidence of the elusive companion. We detect periodic Doppler shifts in the wings of the Ha line with a period of 170 days and an amplitude of 2.25 km s(-1) , consistent with a low-mass binary companion (M approximate to 0.42M circle dot). We then compared small changes in the violet-to-red peak height changes (V/R) with the orbital motion. We find weak evidence that it does follow the orbital motion, as suggested by recent Be binary models by Panoglou et al. Our results, which are similar to those for several other Be stars, suggest that beta CMi may be a product of binary evolution where Roche lobe overflow has spun up the current Be star, likely leaving a hot subdwarf or white dwarf in orbit around the star. Unfortunately, no direct sign of this companion star is found in the very limited archive of International Ultraviolet Explorer spectra.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astrophysical Journal

ISSN

0004-637X

e-ISSN

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Volume of the periodical

836

Issue of the periodical within the volume

1

Country of publishing house

US - UNITED STATES

Number of pages

5

Pages from-to

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UT code for WoS article

000397304500064

EID of the result in the Scopus database

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