The Delta Scuti star 38 Eri from the ground and from space

M. Paparó, Z. Kolláth, R. R. Shobbrook, J. M. Matthews, V. Antoci, J. Benkő, N. K. Park, M. T. Mirtorabi, K. Luedeke, A. Kusakin, Z. Bognár, A. Sódor, A. García-Hernańdez, J. H. Peña, R. Kuschnig, A. F.J. Moffat, J. Rowe, S. M. Rucinski, D. Sasselov, W. W. Weiss

Research output: Contribution to journalArticle

Abstract

We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and partly from space (MOST, 2011). We found 18 frequencies resolving the discrepancy among the previously published frequencies. Some of the frequencies appeared with different relative amplitudes at two epochs, however, we carried out investigation for amplitude variability for only the MOST (Microvariability and Oscillation of STars) data. Amplitude variability was found for one of the three frequencies that satisfy the necessary frequency criteria for linearcombination or resonant-mode coupling. Checking the criteria of beating and resonant-mode coupling we excluded them as possible reason for amplitude variability. The two recently developed methods of rotational splitting and sequence search were applied to find regular spacings based only on frequencies. Doublets or incomplete multiplets with l = 1, 2, and 3 were found in the rotational splitting search. In the sequence search method we identified four sequences. The averaged spacing, probably a combination of the large separation and the rotational frequency, is 1.724 ± 0.092 d-1. Using the spacing and the scaling relation ρ = [0.0394, 0.0554] g cm-3 was derived. The shift of the sequences proved to be the integer multiple of the rotational splitting spacing. Using the precise MOST frequencies and multicolour photometry in a hybrid way, we identified four modes with l = 1, two modes with l = 2, two modes with l = 3, and two modes as l = 0 radial modes.

Original languageEnglish
Pages (from-to)4362-4379
Number of pages18
JournalMonthly Notices of the Royal Astronomical Society
Volume477
Issue number4
DOIs
Publication statusPublished - Jul 11 2018

Fingerprint

spacing
stars
oscillation
coupled modes
oscillations
time measurement
integers
photometry
fine structure
scaling
method
shift

Keywords

  • Space vehicles
  • Stars: individual: 38 Eri
  • Stars: interiors
  • Stars: oscillations
  • Stars: variables: d Scuti
  • Techniques: photometric

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

The Delta Scuti star 38 Eri from the ground and from space. / Paparó, M.; Kolláth, Z.; Shobbrook, R. R.; Matthews, J. M.; Antoci, V.; Benkő, J.; Park, N. K.; Mirtorabi, M. T.; Luedeke, K.; Kusakin, A.; Bognár, Z.; Sódor, A.; García-Hernańdez, A.; Peña, J. H.; Kuschnig, R.; Moffat, A. F.J.; Rowe, J.; Rucinski, S. M.; Sasselov, D.; Weiss, W. W.

In: Monthly Notices of the Royal Astronomical Society, Vol. 477, No. 4, 11.07.2018, p. 4362-4379.

Research output: Contribution to journalArticle

Paparó, M, Kolláth, Z, Shobbrook, RR, Matthews, JM, Antoci, V, Benkő, J, Park, NK, Mirtorabi, MT, Luedeke, K, Kusakin, A, Bognár, Z, Sódor, A, García-Hernańdez, A, Peña, JH, Kuschnig, R, Moffat, AFJ, Rowe, J, Rucinski, SM, Sasselov, D & Weiss, WW 2018, 'The Delta Scuti star 38 Eri from the ground and from space', Monthly Notices of the Royal Astronomical Society, vol. 477, no. 4, pp. 4362-4379. https://doi.org/10.1093/mnras/sty885
Paparó, M. ; Kolláth, Z. ; Shobbrook, R. R. ; Matthews, J. M. ; Antoci, V. ; Benkő, J. ; Park, N. K. ; Mirtorabi, M. T. ; Luedeke, K. ; Kusakin, A. ; Bognár, Z. ; Sódor, A. ; García-Hernańdez, A. ; Peña, J. H. ; Kuschnig, R. ; Moffat, A. F.J. ; Rowe, J. ; Rucinski, S. M. ; Sasselov, D. ; Weiss, W. W. / The Delta Scuti star 38 Eri from the ground and from space. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 477, No. 4. pp. 4362-4379.
@article{0c77195ec7004f3e9d0adb9dd85eb989,
title = "The Delta Scuti star 38 Eri from the ground and from space",
abstract = "We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and partly from space (MOST, 2011). We found 18 frequencies resolving the discrepancy among the previously published frequencies. Some of the frequencies appeared with different relative amplitudes at two epochs, however, we carried out investigation for amplitude variability for only the MOST (Microvariability and Oscillation of STars) data. Amplitude variability was found for one of the three frequencies that satisfy the necessary frequency criteria for linearcombination or resonant-mode coupling. Checking the criteria of beating and resonant-mode coupling we excluded them as possible reason for amplitude variability. The two recently developed methods of rotational splitting and sequence search were applied to find regular spacings based only on frequencies. Doublets or incomplete multiplets with l = 1, 2, and 3 were found in the rotational splitting search. In the sequence search method we identified four sequences. The averaged spacing, probably a combination of the large separation and the rotational frequency, is 1.724 ± 0.092 d-1. Using the spacing and the scaling relation ρ = [0.0394, 0.0554] g cm-3 was derived. The shift of the sequences proved to be the integer multiple of the rotational splitting spacing. Using the precise MOST frequencies and multicolour photometry in a hybrid way, we identified four modes with l = 1, two modes with l = 2, two modes with l = 3, and two modes as l = 0 radial modes.",
keywords = "Space vehicles, Stars: individual: 38 Eri, Stars: interiors, Stars: oscillations, Stars: variables: d Scuti, Techniques: photometric",
author = "M. Papar{\'o} and Z. Koll{\'a}th and Shobbrook, {R. R.} and Matthews, {J. M.} and V. Antoci and J. Benkő and Park, {N. K.} and Mirtorabi, {M. T.} and K. Luedeke and A. Kusakin and Z. Bogn{\'a}r and A. S{\'o}dor and A. Garc{\'i}a-Hernańdez and Pe{\~n}a, {J. H.} and R. Kuschnig and Moffat, {A. F.J.} and J. Rowe and Rucinski, {S. M.} and D. Sasselov and Weiss, {W. W.}",
year = "2018",
month = "7",
day = "11",
doi = "10.1093/mnras/sty885",
language = "English",
volume = "477",
pages = "4362--4379",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

TY - JOUR

T1 - The Delta Scuti star 38 Eri from the ground and from space

AU - Paparó, M.

AU - Kolláth, Z.

AU - Shobbrook, R. R.

AU - Matthews, J. M.

AU - Antoci, V.

AU - Benkő, J.

AU - Park, N. K.

AU - Mirtorabi, M. T.

AU - Luedeke, K.

AU - Kusakin, A.

AU - Bognár, Z.

AU - Sódor, A.

AU - García-Hernańdez, A.

AU - Peña, J. H.

AU - Kuschnig, R.

AU - Moffat, A. F.J.

AU - Rowe, J.

AU - Rucinski, S. M.

AU - Sasselov, D.

AU - Weiss, W. W.

PY - 2018/7/11

Y1 - 2018/7/11

N2 - We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and partly from space (MOST, 2011). We found 18 frequencies resolving the discrepancy among the previously published frequencies. Some of the frequencies appeared with different relative amplitudes at two epochs, however, we carried out investigation for amplitude variability for only the MOST (Microvariability and Oscillation of STars) data. Amplitude variability was found for one of the three frequencies that satisfy the necessary frequency criteria for linearcombination or resonant-mode coupling. Checking the criteria of beating and resonant-mode coupling we excluded them as possible reason for amplitude variability. The two recently developed methods of rotational splitting and sequence search were applied to find regular spacings based only on frequencies. Doublets or incomplete multiplets with l = 1, 2, and 3 were found in the rotational splitting search. In the sequence search method we identified four sequences. The averaged spacing, probably a combination of the large separation and the rotational frequency, is 1.724 ± 0.092 d-1. Using the spacing and the scaling relation ρ = [0.0394, 0.0554] g cm-3 was derived. The shift of the sequences proved to be the integer multiple of the rotational splitting spacing. Using the precise MOST frequencies and multicolour photometry in a hybrid way, we identified four modes with l = 1, two modes with l = 2, two modes with l = 3, and two modes as l = 0 radial modes.

AB - We present and discuss the pulsational characteristics of the Delta Scuti star 38 Eri from photometric data obtained at two widely spaced epochs, partly from the ground (1998) and partly from space (MOST, 2011). We found 18 frequencies resolving the discrepancy among the previously published frequencies. Some of the frequencies appeared with different relative amplitudes at two epochs, however, we carried out investigation for amplitude variability for only the MOST (Microvariability and Oscillation of STars) data. Amplitude variability was found for one of the three frequencies that satisfy the necessary frequency criteria for linearcombination or resonant-mode coupling. Checking the criteria of beating and resonant-mode coupling we excluded them as possible reason for amplitude variability. The two recently developed methods of rotational splitting and sequence search were applied to find regular spacings based only on frequencies. Doublets or incomplete multiplets with l = 1, 2, and 3 were found in the rotational splitting search. In the sequence search method we identified four sequences. The averaged spacing, probably a combination of the large separation and the rotational frequency, is 1.724 ± 0.092 d-1. Using the spacing and the scaling relation ρ = [0.0394, 0.0554] g cm-3 was derived. The shift of the sequences proved to be the integer multiple of the rotational splitting spacing. Using the precise MOST frequencies and multicolour photometry in a hybrid way, we identified four modes with l = 1, two modes with l = 2, two modes with l = 3, and two modes as l = 0 radial modes.

KW - Space vehicles

KW - Stars: individual: 38 Eri

KW - Stars: interiors

KW - Stars: oscillations

KW - Stars: variables: d Scuti

KW - Techniques: photometric

UR - http://www.scopus.com/inward/record.url?scp=85047640042&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85047640042&partnerID=8YFLogxK

U2 - 10.1093/mnras/sty885

DO - 10.1093/mnras/sty885

M3 - Article

VL - 477

SP - 4362

EP - 4379

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 4

ER -