CDS

2003A&A...400..599L

Query : 2003A&A...400..599L

2003A&A...400..599L - Astronomy and Astrophysics, volume 400, 599-612 (2003/3-3)

NRPs and circumstellar activity in HD 127972.

LEVENHAGEN R.S., LEISTER N.V., ZOREC J., JANOT-PACHECO E., HUBERT A.M. and FLOQUET M.

Abstract (from CDS):

Line profile variations (lpv) in HeI, FeII, MgII and SiII transitions were detected in the Be star η Cen (HD 127972) by means of high resolution and S/N spectroscopic observations obtained in six epochs from May 1996 to April 2001. They were interpreted in terms of nonradial pulsations (NRPs). Time analysis was performed using Cleanest algorithm and showed the following frequencies with high order of significance: 0.61c/d, 1.48c/d, 3.81c/d, 5.31c/d, 9.24c/d and 10.35c/d. From phase variation diagrams we estimated mode degrees l in the range 3-8. If the 10.35c/d frequency is considered the first harmonic of 5.31c/d, the corresponding azimuthal number of the mode is |m|=4±2. Except for 0.61c/d, all other frequencies are compatible with NRPs. During the period of progressive activity enhancement in the Hei 6678 line, a strengthening of Balmer emission lines was observed. From Mar. 12 to Mar. 23, 2000, we noticed rapid variations of both Hα peak separation and V/R ratios. Using a simple model for the Hα line emission formation, we outlined an explanation for the season-averaged Hα emission variation in terms of changes of the mass density in the circumstellar envelope. The fundamental parameters of η Cen were analyzed using several methods. The adopted ones account for the stellar fast rotation, which helped us not only to estimate the stellar rotational frequency, but also to show that the star is in the middle of its main sequence life span.

Abstract Copyright: ∼

Journal keyword(s): stars: emission-line, Be - stars: oscillations - stars: individual: η Cen - stars: fundamental parameters - techniques: spectroscopic - line: profiles

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 - 2024 		#notes
1 * eta Cen Be* 14 35 30.4241610 -42 09 28.170782 1.30 2.12 2.31 2.41 2.59 B2Ve 340 1

Query : 2003A&A...400..599L

Basic data :
* eta Cen -- 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: 		* (*,ALS,...), V* (V*,AAVSO), UV (EUVE,TD1), Be* (2006MNRAS), Em* (EM*), NIR (2MASS), IR (IRAS)
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) : 		14 35 30.4241610 -42 09 28.170782 (Optical) [ 0.17 0.11 90 ] A 2007A&A...474..653V
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) : 		14 32 19.3100855 -41 56 21.739612 [ 0.17 0.11 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) : 		322.7740041873 +16.6691349011 [ 0.17 0.11 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 : 		-34.73 -32.72 [0.23 0.18 0] A 2007A&A...474..653V
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) 0.00 [1.6] / z(~) 0.000000 [0.000005] / cz 0.00 [1.60]
   B 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): 		10.67 [0.21] A 2007A&A...474..653V
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: 		B2Ve C 2006MNRAS.371..252L
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 (9) :
U 1.30 [~] C 2002yCat.2237....0D
B 2.12 [~] C 2002yCat.2237....0D
V 2.31 [~] C 2002yCat.2237....0D
R 2.41 [~] C 2002yCat.2237....0D
G 2.2547 [0.0159] C 2018yCat.1345....0G
I 2.59 [~] C 2002yCat.2237....0D
J 2.84 [~] C 2002yCat.2237....0D
H 2.91 [~] C 2002yCat.2237....0D
K 2.96 [~] C 2002yCat.2237....0D
SIMBAD within arcmin
', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay Simbad points in this preview
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within arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!). sed-help-icon
Some important notes on this object about identifications and objects associations.
notes:

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 1381 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (40) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* eta Cen GC 19656 JP11 2516 UBV 12728
AKARI-IRC-V1 J1435304-420928 GCRV 8493 2MASS J14353043-4209281 UBV M 20238
AKARI-FIS-V1 J1435303-420930 GEN# +1.00127972 N30 3301 uvby98 100127972
ALS 15000 GSC 07814-03706 PPM 319680 V* eta Cen
CD-41 8917 HD 127972 ROT 2088 WEB 12321
CPC 0 12445 HD 127973 SAO 225044 [B10] 3724
CPD-41 6839 HIC 71352 SKY# 26543 [CS62] E6 83
EM* MWC 232 HIP 71352 TD1 17567 [JE82] 735
EUVE J1435-42.2 HR 5440 TIC 128116539 AAVSO 1429-41
FK5 537 IRAS 14323-4156 TYC 7814-3706-1 Gaia DR2 6103094140452223872

References (340 between 1850 and 2024) (Total 340)
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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                Reference summaries :

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Collections of Measurements


velocities : 8    ROT : 3    Fe_H : 3    PLX : 2    PM : 4    MK : 13   

   

Observing logs


ISO : 2    IUE : 50   

   

External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * eta Cen

Link by name to the catalogue in VizieR :

AKARI-IRC-V1 J1435304-420928 AKARI-FIS-V1 J1435303-420930 ALS 15000 CD-41 8917 CPD-41 6839
EUVE J1435-42.2 FK5 537 GSC 07814-03706 HD 127972 HD 127973
HIC 71352 HIP 71352 HR 5440 IRAS 14323-4156 2MASS J14353043-4209281
PPM 319680 SAO 225044 TD1 17567 TYC 7814-3706-1 uvby98 100127972
V* eta Cen Gaia DR2 6103094140452223872

Search by coordinates in Vizier (radius: 5 arcsec)

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2023.11.28-11:38:31

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