IRC+10216 & omi Cet SCUBA-2 light curves Virtual Observatory Resource

Authors
  1. Dharmawardena T.E.
  2. Kemper F.
  3. Wouterloot J.G.A
  4. Scicluna P.
  5. Marshall J.P,Wallstrom S.H.J.
  6. Published by
    CDS
Abstract

We present the sub-mm variability of two of the most well-studied AGB stars, IRC +10216 and omicron Ceti. The data are obtained at 450 and 850um as part of pointing calibration observations for the James Clerk Maxwell Telescope's SCUBA-2 instrument over a span of 7yr. The periods are derived using non-parametric methods, Gatspy Supersmoother and P4J, in order not to assume an underlying shape to the periodicity. These were compared to two Lomb-Scargle parametric methods. We find that for both sources and wavelengths the periods derived from all methods are consistent within {sigma}. The 850um phase folded light curves of IRC +10216 show a time lag of ~540d compared to its optical counterpart. We explore the origins of the sub-mm variability and the phase lag using radiative transfer models. Combining the modelling with findings in the literature, we find that the sub-mm emission and phase lag can be partially attributed to the dust formation or destruction cycle. A second, unknown mechanism must be invoked; we defer an investigation of the origin and nature of this mechanism to a future work.

Keywords
  1. variable-stars
  2. millimeter-astronomy
  3. photometry
  4. submillimeter-astronomy
Bibliographic source Bibcode
2019MNRAS.489.3492D
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/489/3492
IVOA Identifier IVOID
ivo://CDS.VizieR/J/MNRAS/489/3492
Document Object Identifer DOI
doi:10.26093/cds/vizier.74893492

Access

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History

2019-10-02T14:46:28Z
Resource record created
2019-10-02T14:46:28Z
Created
2024-08-20T20:12:58Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr