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A New Interpretation of the Period-Luminosity Sequences of Long-period Variables

Trabucchi, Michele; Wood, Peter; Montalban, Josefina; Marigo, P; Pastorelli, Giada; Girardi, L

Description

Period–luminosity (PL) sequences of long-period variables (LPVs) are commonly interpreted as different pulsation modes, but there is disagreement on the modal assignment. Here, we re-examine the observed PL sequences in the Large Magellanic Cloud, including the sequence of long secondary periods (LSPs), and their associated pulsation modes. First, we theoretically model the sequences using linear, radial, nonadiabatic pulsation models and a population synthesis model of the LMC red giants....[Show more]

dc.contributor.authorTrabucchi, Michele
dc.contributor.authorWood, Peter
dc.contributor.authorMontalban, Josefina
dc.contributor.authorMarigo, P
dc.contributor.authorPastorelli, Giada
dc.contributor.authorGirardi, L
dc.date.accessioned2021-04-29T22:43:45Z
dc.identifier.issn0004-637X
dc.identifier.urihttp://hdl.handle.net/1885/231134
dc.description.abstractPeriod–luminosity (PL) sequences of long-period variables (LPVs) are commonly interpreted as different pulsation modes, but there is disagreement on the modal assignment. Here, we re-examine the observed PL sequences in the Large Magellanic Cloud, including the sequence of long secondary periods (LSPs), and their associated pulsation modes. First, we theoretically model the sequences using linear, radial, nonadiabatic pulsation models and a population synthesis model of the LMC red giants. Then, we use a semi-empirical approach to assign modes to the pulsation sequences by exploiting observed multi-mode pulsators. As a result of the combined approaches, we consistently find that sequences B and C′ both correspond to first overtone pulsation, although there are some fundamental mode pulsators at low luminosities on both sequences. The masses of these fundamental mode pulsators are larger at a given luminosity than the mass of the first overtone pulsators. These two sequences, B and C′, are separated by a small period interval in which large amplitude pulsation in a long secondary period (sequence D variability) occurs, meaning that the first overtone pulsation is not seen as the primary mode of pulsation. Observationally, this leads to the splitting of the first overtone pulsation sequence into the two observed sequences, B and C′. Our two independent examinations also show that sequences A′, A, and C correspond to third overtone, second overtone, and fundamental mode pulsation, respectively.
dc.description.sponsorshipWe acknowledge the support from the ERC Consolidator Grant funding scheme (project STARKEY, G.A. No. 615604).
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherIOP Publishing
dc.rights© 2017. The American Astronomical Society
dc.sourceThe Astrophysical Journal
dc.source.urihttps://iopscience.iop.org/article/10.3847/1538-4357/aa8998
dc.subjectMagellanic Clouds
dc.subjectstars: AGB and post-AGB
dc.subjectstars: oscillations
dc.subjectstars: variables: general
dc.titleA New Interpretation of the Period-Luminosity Sequences of Long-period Variables
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume847
dc.date.issued2017
local.identifier.absfor020110 - Stellar Astronomy and Planetary Systems
local.identifier.ariespublicationu4351680xPUB284
local.publisher.urlhttps://iopscience.iop.org
local.type.statusPublished Version
local.contributor.affiliationTrabucchi, Michele, University of Padua
local.contributor.affiliationWood, Peter R, College of Science, ANU
local.contributor.affiliationMontalban, Josefina, University of Padua
local.contributor.affiliationMarigo, P, Universita di Padova
local.contributor.affiliationPastorelli, Giada, Università di Padova
local.contributor.affiliationGirardi, L, Universita di Padova
local.description.embargo2099-12-31
local.bibliographicCitation.issue139
local.identifier.doi10.3847/1538-4357/aa8998
dc.date.updated2020-11-23T10:07:01Z
local.identifier.scopusID2-s2.0-85031088152
CollectionsANU Research Publications

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