A new study of the spectroscopic binary 7 Vul with a Be star primary

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F20%3A00534063" target="_blank" >RIV/67985815:_____/20:00534063 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1051/0004-6361/202037964" target="_blank" >https://doi.org/10.1051/0004-6361/202037964</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202037964" target="_blank" >10.1051/0004-6361/202037964</a>

Jazyk výsledku

angličtina

Název v původním jazyce

A new study of the spectroscopic binary 7 Vul with a Be star primary

Popis výsledku v původním jazyce

We confirmed the binary nature of the Be star 7 Vul, derived a more accurate spectroscopic orbit with an orbital period of 69(d).4212 +/- 0(d).0034, and improved the knowledge of the basic physical elements of the system. Analyzing available photometry and the strength of the H alpha emission, we also document the long-term spectral variations of the Be primary. In addition, we confirmed rapid light changes with a period of 0 : d 5592, which is comparable to the expected rotational period of the Be primary, but note that its amplitude and possibly its period vary with time. We were able to disentangle only the He i 6678 angstrom line of the secondary, which could support our tentative conclusion that the secondary appears to be a hot subdwarf. A search for this object in high-dispersion far-UV spectra could provide confirmation. Probable masses of the binary components are (6 +/- 1) M-circle dot(N) and (0.6 +/- 0.1) M-circle dot(N) fi. If the presence of a hot subdwarf is firmly confirmed, 7Vul might be identified as a rare object with a B4-B5 primary - all Be + hot subdwarf systems found so far contain B0-B3 primaries.

Název v anglickém jazyce

A new study of the spectroscopic binary 7 Vul with a Be star primary

Popis výsledku anglicky

We confirmed the binary nature of the Be star 7 Vul, derived a more accurate spectroscopic orbit with an orbital period of 69(d).4212 +/- 0(d).0034, and improved the knowledge of the basic physical elements of the system. Analyzing available photometry and the strength of the H alpha emission, we also document the long-term spectral variations of the Be primary. In addition, we confirmed rapid light changes with a period of 0 : d 5592, which is comparable to the expected rotational period of the Be primary, but note that its amplitude and possibly its period vary with time. We were able to disentangle only the He i 6678 angstrom line of the secondary, which could support our tentative conclusion that the secondary appears to be a hot subdwarf. A search for this object in high-dispersion far-UV spectra could provide confirmation. Probable masses of the binary components are (6 +/- 1) M-circle dot(N) and (0.6 +/- 0.1) M-circle dot(N) fi. If the presence of a hot subdwarf is firmly confirmed, 7Vul might be identified as a rare object with a B4-B5 primary - all Be + hot subdwarf systems found so far contain B0-B3 primaries.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10308 - Astronomy (including astrophysics,space science)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Astronomy & Astrophysics

ISSN

1432-0746

e-ISSN

—

Svazek periodika

639

Číslo periodika v rámci svazku

July

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

15

Strana od-do

A32

Kód UT WoS článku

000549961400006

EID výsledku v databázi Scopus

2-s2.0-85087915586