2007A&A...469.1057S


C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET09:10:59

2007A&A...469.1057S - Astronomy and Astrophysics, volume 469, 1057-1062 (2007/7-3)

Non-radial oscillations of the rapidly rotating Be star HD 163868.

SAVONIJE G.J.

Abstract (from CDS):

Oscillations in rotating stars with frequency σ of the same order or smaller than the rotation rate Ω cannot be described by a single spherical harmonic due to the effect of the Coriolis force. This is a serious complication which is usually treated by writing the eigenfunctions as a (truncated) sum of different spherical harmonic degrees for a given m-value, or by neglecting the θ part of the rotation vector (Traditional Approximation). We aim for a more adequate treatment of the coupling with higher angular degrees for low frequency oscillations of rotating stars by taking the Coriolis force fully into account, so that the coupling is included in the analysis (up to the grid resolution) and to compare the results with analyses based on the above mentioned approximations. To this end a new, more efficient version of a 2D(r, θ) implicit oscillation code was developed in which no a priori assumptions about the θ variation of the eigenfunctions is made, enabling a better treatment of the rotational truncation of g-modes near the stellar poles, and for which ∼150 gridpoints in θ are feasible. We test the code by comparing the simulated oscillation spectrum with that obtained by the MOST photometry for the ≃6M Be star HD 163868. We find both prograde and retrograde overstable modes (although more prograde than retrograde modes) and confirm the existence of low degree odd r-modes, destabilised by the κ-mechanism. The ultra-low frequency modes that could not be explained in a previous analysis are interpretated as (high degree) retrograde m=1 modes with |σ|~Ω i.e. σ∼0. A reasonably good fit to the observed oscillation spectrum is possible if we assume that only even modes are observed (no unstable r-modes visible). This requires a nearly equator-on view of the observed star, consistent with the measured high vsini value of 250km/s.

Abstract Copyright:

Journal keyword(s): stars: emission-line, Be - stars: oscillations

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 HD 163868 Be* 17 59 56.4312436919 -33 24 29.984102749 6.69 7.311 7.354     B2/3(V)ne 61 0

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2019.12.11CET09:10:59

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


Basic data :
HD 163868 -- Be Star
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:
Be* (), * (HD,AGASC,...), Em* (EM*,Hen,...), UV (TD1,[SC96]), Pu* (Ref), V* (V*), IR (2MASS)
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) :
17 59 56.4312436919 -33 24 29.984102749 (Optical) [ 0.0451 0.0404 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) :
17 56 38.5558152566 -33 24 22.355266671 [ 0.0451 0.0404 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) :
357.6952319321296 -04.9064949685492 [ 0.0451 0.0404 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 :
4.812 -2.898 [0.090 0.074 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) -16.00 [3] / z(~) -0.000053 [0.000010] / cz -16.00 [3.00]
   C 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):
1.7016 [0.0452] 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:
B2/3(V)ne E 1982MSS...C03....0H
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 (7) :
U 6.69 [~] D 1982IAUS...98..261J
B 7.311 [0.015] D 2000A&A...355L..27H
V 7.354 [0.010] D 2000A&A...355L..27H
G 7.1772 [0.0058] C 2018yCat.1345....0G
J 7.136 [0.020] C 2003yCat.2246....0C
H 7.06 [0.05] C 2003yCat.2246....0C
K 6.881 [0.029] 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 (32) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

HD 163868 GEN# +1.00163868 ROT 6514 V* V3984 Sgr
AGASC 967585616 GSC 07382-01514 SAO 209569 WRAY 15-1817
CD-33 12700 Hbg 1514 SKY# 32633 [JE82] 936
CPC 17 9619 Hen 3-1543 TD1 21316 [SC95] M 175
CPD-33 4751 HIC 88123 TYC 7382-1514-1 [SC96] Mis 855
EM* MWC 277 HIP 88123 UBV M 22503 [SC96] GC 309
GC 24480 2MASS J17595643-3324299 UCAC3 114-320769 Gaia DR2 4042509775560348672
GCRV 23057 PPM 297103 uvby98 100163868 Gaia DR1 4042509771176937344

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References (61 between 1850 and 2020) (Total 61)
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 : 2    ROT : 1    PM : 4    PLX : 4    MK : 3   

   


External archives :

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

Link by name to the catalogue in VizieR :

HD 163868 CD-33 12700 CPD-33 4751 GSC 07382-01514 HIC 88123
HIP 88123 2MASS J17595643-3324299 PPM 297103 SAO 209569 TD1 21316
TYC 7382-1514-1 UCAC3 114-320769 uvby98 100163868 V* V3984 Sgr Gaia DR2 4042509775560348672
Gaia DR1 4042509771176937344

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2019.12.11-09:10:59

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