|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Kepler's first view of O-star variability: K2 data of five O stars in Campaign 0 as a proof-of-concept for O-star asteroseismology | | B. Buysschaert
; C. Aerts
; S. Bloemen
; J. Debosscher
; C. Neiner
; M. Briquet
; J. Vos
; P. Papics
; R. Manick
; V. Schmid
; H. Van Winkel
; A. Tkachenko
; | | Date: |
11 Jul 2015 | | Abstract: | We present high-precision photometric light curves of five O-type stars
observed with the refurbished {it Kepler/} satellite during its Campaign 0.
For one of the stars, we also assembled high-resolution ground-based
spectroscopy with the {sc hermes} spectrograph attached to the 1.2-m Mercator
telescope. The stars EPIC202060097 (O9.5V) and EPIC202060098 (O7V) exhibit
monoperiodic variability due to rotational modulation with an amplitude of 5.6
mmag and 9.3 mmag and a rotation period of 2.63 d and 5.03 d, respectively.
EPIC202060091 (O9V) and EPIC202060093 (O9V:pe) reveal variability at low
frequency but the cause is unclear. EPIC202060092 (O9V:p) is discovered to be a
spectroscopic binary with at least one multiperiodic $eta,$Cep-type pulsator
whose detected mode frequencies occur in the range $[0.11,6.99]$ d$^{-1}$ and
have amplitudes between 0.8 and 2.0 mmag. Its pulsation spectrum is shown to be
fully compatible with the ones predicted by core-hydrogen burning O-star
models. Despite the short duration of some 33,d and the limited data quality
with a precision near 100 $mu$mag of these first K2 data, the diversity of
possible causes for O-star variability already revealed from campaigns of
similar duration by the MOST and CoRoT satellites is confirmed with {it
Kepler}. We provide an overview of O-star space photometry and give arguments
why future K2 monitoring during Campaigns 11 and 13 at short cadence,
accompanied by time-resolved high-precision high-resolution spectroscopy opens
up the possibility of in-depth O-star seismology. | | Source: | arXiv, 1507.3091 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER