Absolute parameters of young stars: NO Puppis

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dc.authorid0000-0001-5289-8850
dc.authorid0000-0002-3125-9010
dc.contributor.authorErdem, Ahmet
dc.contributor.authorBakis, Volkan
dc.contributor.authorSouthworth, John
dc.contributor.authorRhodes, Michael
dc.contributor.authorKahraman Alicavus, Filiz
dc.contributor.authorBudding, Edwin
dc.contributor.authorBlackford, Mark G.
dc.date.accessioned2026-02-03T12:02:31Z
dc.date.available2026-02-03T12:02:31Z
dc.date.issued2025
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractThe southern early-type, young, eccentric-orbit eclipsing binary NO Puppis forms the A component of the multiple star Gaia DR3 5528147999779517568. The B component is an astrometric binary now at a separation of about 8.1 arcsec. There may be other fainter stars in this interesting but complex stellar system. We have combined several lines of evidence, including TESS data from four sectors, new ground-based BVR photometry, HARPS (ESO) and HERCULES (UCMJO) high-resolution spectra and astrometry of NO Pup. We derive a revised set of absolute parameters with increased precision. Alternative optimal curve-fitting programs were used in the analysis, allowing a wider view of modelling and parameter uncertainties. The main parameters are as follows: M-Aa = 3.58 +/- 0.11, M-Ab = 1.68 +/- 0.09 (M-circle dot); R-Aa=2.17 +/- 0.03, R-AB=1.51 +/- 0.06 (R-circle dot), and T-eAa= 13 300 +/- 500, T-eAb =7400 +/- 500 (K). We estimate approximate masses of the wide companions, Ba and Bb, as M-Ba = 2.0 and M-Bb 1.8 (M-circle dot). The close binary's orbital separation is a = 8.51 +/- 0.05 (R-circle dot); its age is approximately 20 Myr and distance 172 +/- 1 pc. The close binary's secondary (Ab) appears to be the source of low amplitude delta Scuti-type oscillations, although the form of these oscillations is irregular and unrepetitive. Analysis of the lambda 6678 He I profile of the primary show synchronism of the mean bodily and orbital rotations. The retention of significant orbital eccentricity, in view of the closeness of the A-system components, is unexpected and poses challenges for the explanation that we discuss.
dc.description.sponsorshipNASA [NAS 5-26555]
dc.description.sponsorshipScientific and Technological Research Council (TUBITAK) project [120F330]
dc.description.sponsorshipThis paper includes data collected by the TESS mission and obtained from the MAST data archive at the Space Telescope Science Institute (STScI). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. This research has made use of the Washington Double Star (WDS) Catalogue maintained at the U.S. Naval Observatory. We thank Dr. Rachel Matson for extracting data from the WDS for us, and also the University of Queensland for collaboration software. FKA thanks the Scientific and Technological Research Council (TUBITAK) project 120F330 for supporting the study. The authors thank Prof. G. Handler for his valuable comments on pulsational analysis. This work uses the VizieR catalogue access tool, CDS, Strasbourg, France; the SIMBAD database, operated at CDS, Strasbourg, France. We thank the UCMJO time allocation committee for observing time with hercules. We recently learned of the death in December 2024 of Sverre Aarseth. He was a pioneer in N-body (both small and large N) numerical integrations and inspired many people in this field, including one of the authors (MA). He will be greatly missed.
dc.identifier.doi10.1017/pasa.2025.10080
dc.identifier.issn1323-3580
dc.identifier.issn1448-6083
dc.identifier.scopus2-s2.0-105015086869
dc.identifier.scopusqualityQ1
dc.identifier.urihttps://doi.org/10.1017/pasa.2025.10080
dc.identifier.urihttps://hdl.handle.net/20.500.12428/34788
dc.identifier.volume42
dc.identifier.wosWOS:001576704400001
dc.identifier.wosqualityQ1
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherCambridge Univ Press
dc.relation.ispartofPublications of the Astronomical Society of Australia
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WOS_20260130
dc.subject(stars:) binaries (including multiple): close
dc.subject(stars:) binaries: eclipsing
dc.subjectstars: individual:
dc.titleAbsolute parameters of young stars: NO Puppis
dc.typeArticle

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