2010A&A...509A..90L


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST17:16:03

2010A&A...509A..90L - Astronomy and Astrophysics, volume 509, A90-90 (2010/1-1)

A δ Scuti star in the post-MS contraction phase: 44 Tauri.

LENZ P., PAMYATNYKH A.A., ZDRAVKOV T. and BREGER M.

Abstract (from CDS):

The evolutionary stage of the δ Scuti star 44 Tau has been unclear. Recent asteroseismic studies have examined models on the main sequence, as well as in the expansion phase of the post-main sequence evolution. However, these models could not reproduce all of the observed frequencies, the mode instability range, and the fundamental stellar parameters simultaneously. A recent photometric study has increased the number of detected independent modes in 44 Tau to 15, and a newly found gravity mode at 5.30c/d extends the observed frequency range. One of the possible evolutionary stages of 44 Tau has not yet been considered: the overall contraction phase after the main sequence. We computed asteroseismic models to examine whether models in this evolutionary stage provide a better fit of the observed frequency spectrum. We used Dziembowski's pulsation code to compute nonadiabatic frequencies of radial and nonradial modes. Observation of two radial modes and an avoided crossing of dipole modes put strong constraints on the models. A two-parameter overshooting routine is utilized to determine the efficiency of element mixing in the overshoot layer above the convective core. We find that pulsation models in the post-MS contraction phase successfully reproduce the observed frequency range, as well as the frequency values of all individual radial and nonradial modes. The theoretical frequencies of the mixed modes at 7.79c/d and 9.58c/d are in better agreement with the observations if efficient element mixing in a small overshoot layer is assumed.

Abstract Copyright:

Journal keyword(s): δ Sct - stars: oscillations - stars: individual: 44 Tau

Simbad objects: 1

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Number of rows : 1

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 * p Tau dS* 04 10 49.8603883663 +26 28 51.433802246   5.715 5.387     F2IV-V 193 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.10.24CEST17:16:03

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
* p Tau -- Variable Star of delta Sct type
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (*,AG,...), IR (IRAS,2MASS), dS* (Ref), V* (V*), UV (TD1), X (1RXS)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
04 10 49.8603883663 +26 28 51.433802246 (Optical) [ 0.1175 0.0752 90 ] A 2018yCat.1345....0G
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
04 07 46.8372358744 +26 21 07.771555178 [ 0.1175 0.0752 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
168.9601351240229 -18.0799512145847 [ 0.1175 0.0752 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-30.528 -34.938 [0.273 0.225 90] A 2018yCat.1345....0G
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 17.10 [0.3] / z(~) 0.000057 [0.000001] / cz 17.10 [0.30]
   A 2006AstL...32..759G
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
15.3323 [0.1308] A 2018yCat.1345....0G
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
F2IV-V C ~
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (6) :
B 5.715 [0.014] D 2000A&A...355L..27H
V 5.387 [0.009] D 2000A&A...355L..27H
G 5.2738 [0.0015] C 2018yCat.1345....0G
J 4.883 [0.206] D 2003yCat.2246....0C
H 4.683 [0.188] D 2003yCat.2246....0C
K 4.482 [0.036] C 2003yCat.2246....0C
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The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (33) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* p Tau HD 26322 ROT 611 V* IM Tau
* 44 Tau HIC 19513 1RXS J041049.8+262830 WEB 3736
AG+26 411 HIP 19513 SAO 76485 YZ 26 2008
BD+26 686 HR 1287 SKY# 6381 [HFE83] 282
FK5 1116 IRAS 04077+2621 SRS 31116 Gaia DR2 162405533940990080
GC 5020 2MASS J04104987+2628515 TD1 2875 Gaia DR1 162405529644328960
GCRV 2386 N30 859 TYC 1822-2315-1
GEN# +1.00026322 PMC 90-93 741 UBV M 9978
GSC 01822-02315 PPM 93305 uvby98 100026322

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References (193 between 1850 and 2020) (Total 193)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements


distance : 1    velocities : 8    ROT : 4    PM : 6    Fe_H : 4    PLX : 4    MK : 3   

   

Observing logs


IUE : 17   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : * p Tau

Link by name to the catalogue in VizieR :

AG+26 411 BD+26 686 FK5 1116 GSC 01822-02315 HD 26322
HIC 19513 HIP 19513 HR 1287 IRAS 04077+2621 2MASS J04104987+2628515
PPM 93305 1RXS J041049.8+262830 SAO 76485 TD1 2875 TYC 1822-2315-1
uvby98 100026322 V* IM Tau Gaia DR2 162405533940990080 Gaia DR1 162405529644328960

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2020.10.24-17:16:03

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