1999A&AS..136...59A


Query : 1999A&AS..136...59A

1999A&AS..136...59A - Astron. Astrophys., Suppl. Ser., 136, 59-63 (1999/April-1)

B[e] stars. VIII. MWC 342.

ANDRILLAT Y. and JASCHEK C.

Abstract (from CDS):

On the basis of spectroscopic CCD material obtained at the Haute Provence Observatory, we provide line identifications and equivalent width measurements in the wavelength region 4095-8935 Å of the spectrum of MWC 342. Two hundred eighty emission features are identified and eighteen absorption features. Nine interstellar bands could be identified. Some of the remaining absorption lines correspond to a B0 type star. The cooler emission lines correspond to a spectrum of an early A-type star. The temperatures derived from both spectral types (29000 and 9000K) are in excellent agreement with the temperatures derived by photometrists.

Abstract Copyright:

Journal keyword(s): stars: emission line, B[e] - stars: individual: MWC 342 - variables stars - peculiar

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 - 2022
#notes
1 EM* MWC 342 Em* 20 23 03.6172964112 +39 29 49.920095616 11.62 11.5 10.6     B[e] 80 1

Query : 1999A&AS..136...59A

Basic data :
EM* MWC 342 -- Emission-line 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,CSI,...), Em* (EM*,HBHA,...), IR (IRAS,2MASS,...), V* (2013A&A,V*), Ae* (1999AJ), Er* (2012A&A)
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) :
20 23 03.6172964112 +39 29 49.920095616 (Optical) [ 0.0091 0.0109 90 ] A 2020yCat.1350....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) :
20 21 14.5317007045 +39 20 07.744709410 [ 0.0091 0.0109 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) :
077.6162207665927 +01.3022136581034 [ 0.0091 0.0109 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 :
-2.953 -5.883 [0.012 0.015 90] A 2020yCat.1350....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) -23 [1] / z(~) -0.000077 [0.000003] / cz -23.00 [1.00]
   D 2016MNRAS.456.1424A
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):
0.5662 [0.0119] A 2020yCat.1350....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:
B[e] D 1976A&A....47..293A
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 11.62 [~] D 2003AJ....125.2531R
B 11.5 [~] E ~
V 10.6 [~] E ~
G 9.716651 [0.004576] C 2020yCat.1350....0G
J 6.979 [0.020] C 2003yCat.2246....0C
H 5.800 [0.018] C 2003yCat.2246....0C
K 4.679 [0.017] C 2003yCat.2246....0C
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!).
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Some important notes on this object about identifications and objects associations.
notes:

  • The nature of MWC 342 remains unclear (Ae/Be, Symbiotic, binary, ?), see e.g. 2013A&A...554A.143K


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

: 1 : 2435 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (25) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

EM* MWC 342 Hilt 952 TYC 3156-42-1 [NH52] 14
ALS 11256 IRAS 20212+3920 UBV 17681 Gaia DR2 2061430134240761728
CSI+39-20212 JP11 5214 UBV M 50929 Gaia EDR3 2061430134240761728
GEN# +8.02390041 LS II +39 41 UCAC2 45557671 Gaia DR1 2061430129934450176
GSC 03156-00042 2MASS J20230361+3929498 V* V1972 Cyg
HBHA 3703-11 MSX6C G077.6160+01.3026 [D75b] Em* 20+069
Hen 3-1892 TIC 13966711 [KW97] 46-9

References (80 between 1850 and 2022) (Total 80)
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 : 2    PLX : 3    PM : 2    MK : 3   

   


External archives :

Data at NED - NASA/IPAC Extragalactic Database : EM* MWC 342

Link by name to the catalogue in VizieR :

ALS 11256 GSC 03156-00042 IRAS 20212+3920 LS II +39 41 2MASS J20230361+3929498
MSX6C G077.6160+01.3026 TYC 3156-42-1 UCAC2 45557671 V* V1972 Cyg Gaia DR2 2061430134240761728
Gaia EDR3 2061430134240761728 Gaia DR1 2061430129934450176

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2022.05.26-16:05:30

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