2006A&A...448.1165S


C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST11:35:04

2006A&A...448.1165S - Astronomy and Astrophysics, volume 448, 1165-1168 (2006/3-4)

Search for radial velocity and magnetic field pulsational variations in the roAp star γ Equulei.

SAVANOV I., HUBRIG S., MATHYS G., RITTER A. and KURTZ D.W.

Abstract (from CDS):

A new continuous 3.5h series of high-resolution spectroscopic observations of the roAp star γ Equ, with about 12 points per pulsation cycle, is presented to study the mean magnetic field modulus variability with the pulsation period. Radial velocity variations with amplitudes of up to approximately 400m/s are clearly detected in the rare earth lines present in the covered spectral range. Two frequencies are resolved in their analysis, which are consistent with frequencies previously observed in the star. No significant radial velocity variation is detected for the line FeIIλ6149.2. The mean magnetic field modulus derived from measurement of the wavelength separation of the magnetically resolved components of this line does not show any variation, with a 3σ upper limit of ∼10G. While our results are consistent with the conclusion of the previous studies, difficulties to reconcile this result with those of other works may be attributed, in part at least, to the use of different diagnostic lines in different works and to the failure of all studies so far to fully resolve all the pulsation frequencies of γ Equ.

Abstract Copyright:

Journal keyword(s): stars: magnetic fields - stars: oscillations - stars: chemically peculiar

Status at CDS:  

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 * gam Equ a2* 21 10 20.5001160337 +10 07 53.682085548 5.03 4.94 4.68 4.43 4.32 A9VpSrCrEu 512 1

    Equat.    Gal    SGal    Ecl

C.D.S. - SIMBAD4 rel 1.7 - 2020.05.27CEST11:35:04

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


Basic data :
* gam Equ -- Variable Star of alpha2 CVn 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,...), ** (**,ADS,...), IR (IRAS,2MASS), PM* (LSPM), a2* (Ref), V* (V*), UV (TD1)
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) :
21 10 20.5001160337 +10 07 53.682085548 (Optical) [ 0.1930 0.1575 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) :
21 07 54.5856575678 +09 55 44.908801952 [ 0.1930 0.1575 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) :
059.9328661485974 -24.7629938695708 [ 0.1930 0.1575 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 :
45.342 -151.506 [0.457 0.459 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) -16.489 [0.0004] / z(spectroscopic) -0.000055 [0.000000] / cz -16.49 [0.00]
   (Opt) A 2018A&A...616A...7S
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):
28.7705 [0.2323] 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:
A9VpSrCrEu C 1985ApJS...59...95A
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 5.03 [~] C 2002yCat.2237....0D
B 4.94 [~] C 2002yCat.2237....0D
V 4.68 [~] C 2002yCat.2237....0D
R 4.43 [~] C 2002yCat.2237....0D
G 4.5937 [0.0023] C 2018yCat.1345....0G
I 4.32 [~] C 2002yCat.2237....0D
J 4.28 [~] C 2002yCat.2237....0D
H 4.18 [~] C 2002yCat.2237....0D
K 4.10 [~] C 2002yCat.2237....0D
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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 ) :

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: 2
Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (46) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* gam Equ GC 29591 2MASS J21102048+1007537 UBV 18317
* 5 Equ GCRV 13305 N30 4680 UBV M 25493
** KNT 5 GEN# +1.00201601J PLX 5091 USNO-B1.0 1001-00586248
** BU 71AB GSC 01108-02583 PLX 5091.00 uvby98 100201601 ABV
** STF 4054AB HD 201601 PMC 90-93 1102 V* gam Equ
ADS 14702 AB HIC 104521 PPM 139704 WDS J21103+1008AB
AG+09 2937 HIP 104521 Renson 56210 WEB 19021
ASCC 991130 HR 8097 ROT 3082 YZ 9 10603
BD+09 4732 IDS 21055+0944 AB SAO 126593 [HFE83] 1422
CCDM J21104+1007AB IRAS 21079+0955 SKY# 40281 Gaia DR2 1744662586614707072
CSI+09 4732 1 JP11 3320 SRS 31555
FK5 1555 LSPM J2110+1007 TD1 27750

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References (512 between 1850 and 2020) (Total 512)
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    diameter : 1    velocities : 10    ROT : 1    PM : 7    Fe_H : 19    PLX : 4    MK : 12   

   

Observing logs


ISO : 1    IUE : 1   

   


External archives :

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

Data at NED - NASA/IPAC Extragalactic Database : * gam Equ

Link by name to the catalogue in VizieR :

AG+09 2937 BD+09 4732 CCDM J21104+1007AB FK5 1555 GSC 01108-02583
HD 201601 HIC 104521 HIP 104521 HR 8097 IRAS 21079+0955
LSPM J2110+1007 2MASS J21102048+1007537 PLX 5091 PPM 139704 SAO 126593
TD1 27750 USNO-B1.0 1001-00586248 uvby98 100201601 ABV V* gam Equ WDS J21103+1008AB
Gaia DR2 1744662586614707072

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2020.05.27-11:35:04

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