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The VMC survey - XLVIII. Classical cepheids unveil the 3D geometry of the LMC

Ripepi, Vincenzo ; Chemin, Laurent ; Molinaro, Roberto ; Cioni, Maria Rosa L. ; Bekki, Kenji ; Clementini, Gisella ; De Grijs, Richard ; De Somma, Giulia ; El Youssoufi, Dalal and Girardi, Léo , et al. (2022) In Monthly Notices of the Royal Astronomical Society 512(1). p.563-582
Abstract

We employed the VISTA near-infrared YJKssurvey of the Magellanic System (VMC) to analyse the Y, J, and Ks light curves of δCepheid stars (DCEPs) in the Large Magellanic Cloud (LMC). Our sample consists of 4408 objects accounting for 97 per cent of the combined list of OGLE IV and Gaia DR2 DCEPs. We determined a variety of period-luminosity (PL) and period-Wesenheit PW relationships for Fundamental (F) and First Overtone (1O) pulsators. We discovered for the first time a break in these relationships for 1O DCEPs at P= 0.58 d. We derived relative individual distances for DCEPs in the LMC with a precision of ∼1 kpc, calculating the position angle of the line of nodes and inclination of the galaxy: θ = 145.6 ± 1.0 deg and i = 25.7 ± 0.4... (More)

We employed the VISTA near-infrared YJKssurvey of the Magellanic System (VMC) to analyse the Y, J, and Ks light curves of δCepheid stars (DCEPs) in the Large Magellanic Cloud (LMC). Our sample consists of 4408 objects accounting for 97 per cent of the combined list of OGLE IV and Gaia DR2 DCEPs. We determined a variety of period-luminosity (PL) and period-Wesenheit PW relationships for Fundamental (F) and First Overtone (1O) pulsators. We discovered for the first time a break in these relationships for 1O DCEPs at P= 0.58 d. We derived relative individual distances for DCEPs in the LMC with a precision of ∼1 kpc, calculating the position angle of the line of nodes and inclination of the galaxy: θ = 145.6 ± 1.0 deg and i = 25.7 ± 0.4 deg. The bar and the disc are seen under different viewing angles. We calculated the ages of the pulsators, finding two main episodes of DCEP formation lasting ∼40 Myr which happened 93 and 159 Myr ago. Likely as a result of its past interactions with the SMC, the LMC shows a non-planar distribution, with considerable structuring: the bar is divided into two distinct portions, the eastern and the western displaced by more than 1 kpc from each other. Similar behaviour is shown by the spiral arms. The LMC disc appears 'flared' and thick, with a disc scale height of h ∼0.97 kpc. This feature can be explained by strong tidal interactions with the Milky Way and/or the Small Magellanic Cloud or past merging events with now disrupted LMC satellites.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
galaxies: photometry, galaxies: stellar content, galaxies: structure, Magellanic Clouds, stars: distances, stars: variables: Cepheids
in
Monthly Notices of the Royal Astronomical Society
volume
512
issue
1
pages
20 pages
publisher
Oxford University Press
external identifiers
  • scopus:85127950238
ISSN
0035-8711
DOI
10.1093/mnras/stac595
language
English
LU publication?
yes
id
72808b85-8bcc-4116-a607-cd4038cfa697
date added to LUP
2022-06-13 15:33:19
date last changed
2024-04-16 00:19:43
@article{72808b85-8bcc-4116-a607-cd4038cfa697,
  abstract     = {{<p>We employed the VISTA near-infrared YJKssurvey of the Magellanic System (VMC) to analyse the Y, J, and Ks light curves of δCepheid stars (DCEPs) in the Large Magellanic Cloud (LMC). Our sample consists of 4408 objects accounting for 97 per cent of the combined list of OGLE IV and Gaia DR2 DCEPs. We determined a variety of period-luminosity (PL) and period-Wesenheit PW relationships for Fundamental (F) and First Overtone (1O) pulsators. We discovered for the first time a break in these relationships for 1O DCEPs at P= 0.58 d. We derived relative individual distances for DCEPs in the LMC with a precision of ∼1 kpc, calculating the position angle of the line of nodes and inclination of the galaxy: θ = 145.6 ± 1.0 deg and i = 25.7 ± 0.4 deg. The bar and the disc are seen under different viewing angles. We calculated the ages of the pulsators, finding two main episodes of DCEP formation lasting ∼40 Myr which happened 93 and 159 Myr ago. Likely as a result of its past interactions with the SMC, the LMC shows a non-planar distribution, with considerable structuring: the bar is divided into two distinct portions, the eastern and the western displaced by more than 1 kpc from each other. Similar behaviour is shown by the spiral arms. The LMC disc appears 'flared' and thick, with a disc scale height of h ∼0.97 kpc. This feature can be explained by strong tidal interactions with the Milky Way and/or the Small Magellanic Cloud or past merging events with now disrupted LMC satellites.</p>}},
  author       = {{Ripepi, Vincenzo and Chemin, Laurent and Molinaro, Roberto and Cioni, Maria Rosa L. and Bekki, Kenji and Clementini, Gisella and De Grijs, Richard and De Somma, Giulia and El Youssoufi, Dalal and Girardi, Léo and Groenewegen, Martin A.T. and Ivanov, Valentin and Marconi, Marcella and McMillan, Paul J. and Van Loon, Jacco Th}},
  issn         = {{0035-8711}},
  keywords     = {{galaxies: photometry; galaxies: stellar content; galaxies: structure; Magellanic Clouds; stars: distances; stars: variables: Cepheids}},
  language     = {{eng}},
  number       = {{1}},
  pages        = {{563--582}},
  publisher    = {{Oxford University Press}},
  series       = {{Monthly Notices of the Royal Astronomical Society}},
  title        = {{The VMC survey - XLVIII. Classical cepheids unveil the 3D geometry of the LMC}},
  url          = {{http://dx.doi.org/10.1093/mnras/stac595}},
  doi          = {{10.1093/mnras/stac595}},
  volume       = {{512}},
  year         = {{2022}},
}