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Reference: McQuillan, A, Aigrain, S and Roberts, S, (2012). Statistics of stellar variability from Kepler : I. Revisiting Quarter 1 with an astrophysically robust systematics correction. Astronomy and Astrophysics, 539, A137-A137.Citable link to this page:

 

Statistics of stellar variability from Kepler : I. Revisiting Quarter 1 with an astrophysically robust systematics correction

Abstract: We investigate the variability properties of main sequence stars in the firstmonth of Kepler data, using a new astrophysically robust systematicscorrection, and find that 60% of stars are more variable then the active Sun.We define low and high variability samples, with a cut corresponding to twicethe variability level of the active Sun, and compare the properties of thestars belonging to each sample. We show tentative evidence that the more activestars have lower proper motions and may be located closer to the galacticplane. We also investigate the frequency content of the variability, findingclear evidence for periodic or quasi-periodic behaviour in 16% of stars, andshowing that there exist significant differences in the nature of variabilitybetween spectral types. Of the periodic objects, most A and F stars have shortperiods (< 2 days) and highly sinusoidal variability, suggestive of pulsations,whilst G, K and M stars tend to have longer periods (> 5 days, with a trendtowards longer periods at later spectral types) and show a mixture of periodicand stochastic variability, indicative of activity. Finally, we useauto-regressive models to characterise the stochastic component of thevariability, and show that its typical amplitude and time-scale both increasetowards later spectral types, which we interpret as a corresponding increase inthe characteristic size and life-time of active regions.

Peer Review status:Peer reviewedPublication status:PublishedVersion:Publisher's versionNotes:Copyright © ESO 2012. Citation: McQuillan, A., Aigrain, S., and Roberts, S. (2012, March). Statistics of stellar variability from Kepler . Astronomy and Astrophysics. EDP Sciences. http://doi.org/10.1051/0004-6361/201016148

Bibliographic Details

Publisher: EDP Sciences

Publisher Website: http://publications.edpsciences.org/

Journal: Astronomy and Astrophysicssee more from them

Publication Website: http://www.aanda.org/

Issue Date: 2012

pages:A137-A137Identifiers

Urn: uuid:fd1b9a1d-8e91-4546-89ec-a68aca280fc2

Source identifier: 319067

Eissn: 1432-0746

Doi: https://doi.org/10.1051/0004-6361/201016148

Issn: 0004-6361 Item Description

Type: Journal article;

Language: en

Version: Publisher's versionKeywords: stars: statistics stars: rotation galaxy: structure stars: activity photometric techniques Tiny URL: pubs:319067

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Author: McQuillan, A - - - Aigrain, S - institutionUniversity of Oxford Oxford, MPLS, Physics, Astrophysics - - - Roberts, S - institutio

Source: https://ora.ox.ac.uk/objects/uuid:fd1b9a1d-8e91-4546-89ec-a68aca280fc2



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