2004A&A...428..181H

Query : 2004A&A...428..181H

2004A&A...428..181H - Astronomy and Astrophysics, volume 428, 181-190 (2004/12-2)

Refined system parameters for the pre-cataclysmic binary NN Serpentis.

HAEFNER R., FIEDLER A., BUTLER K. and BARWIG H.

Abstract (from CDS):

NN Ser is known to be a 17mag pre-cataclysmic binary consisting of a hot white dwarf and a cool late type star orbiting each other with a period of 3h 7m. The system shows very deep eclipses and a pronounced reflection effect. Using the FORS instruments at the VLT the late type star could now be detected photometrically at 22.8mag during eclipse and monitored spectroscopically. These data combined with earlier high speed photometric and phase-resolved spectroscopic observations form the basis for a determination of refined system parameters for NN Ser. The spectral type of the late type star is found to be M4.75. A model atmosphere analysis of the white dwarf yields a temperature of 57000±3000K and logg=7.6±0.1. The presence of He in the atmosphere (NHe=2±0.5x10–4 by number) indicates that the white dwarf is a hydrogen-helium hybrid star of type DAO1. Since the derived radial velocity curves prevent an unambiguous determination of the mass ratio the white dwarf's mass of 0.54±0.05M☉ is inferred using the results of the model atmosphere analysis and recent evolutionary models. The mass of the M star is determined via a well calibrated M-R relation to be 0.150±0.008M☉. The photometric measurements are analysed using a sophisticated light curve synthesis program and yield the following results: i=84.6°±1.1°, Rwd=0.0189±0.0010R☉, and RMstar(polar)=0.174±0.009R☉. The shape of the cool star turns out to be slightly ellipsoidal. Its temperature at the un-heated hemisphere (backside) is 2920±70K while the heated hemisphere (sub-stellar point) has a temperature of 7125±200K.

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Journal keyword(s): stars: binaries: eclipsing - stars: binaries: spectroscopic - stars: late-type - stars: white dwarfs - stars: fundamental parameters - stars: individual: NN Ser

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 V* NN Ser CV* 15 52 56.1203524080 +12 54 44.429312196     16.51     DAO1+M4 274 0

Query : 2004A&A...428..181H

Basic data :
V* NN Ser -- Cataclysmic Binary
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: 		WD? (2019MNRAS), V* (2018AJ,V*), * ([HH95],Gaia), MIR (WISEA,WISE), CV* (2017ARep), WD* (WD), EB* (2014ApJS), UV (PG), NIR (2MASS), Opt (ATO)
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) : 		15 52 56.1203524080 +12 54 44.429312196 (Optical) [ 0.0497 0.0557 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) : 		15 50 35.5074124438 +13 03 39.305144353 [ 0.0497 0.0557 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) : 		023.6529230497113 +45.3388622667198 [ 0.0497 0.0557 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 : 		-30.170 -59.084 [0.055 0.057 90] A 2020yCat.1350....0G
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): 		1.9438 [0.0662] 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: 		DAO1+M4 C 2010MNRAS.402.2591P
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 (5) :
V 16.51 [~] V3 D 2014ApJS..213....9D
G 16.531082 [0.014687] C 2020yCat.1350....0G
J 16.907 [0.163] D 2003yCat.2246....0C
H 16.254 [0.204] D 2003yCat.2246....0C
K 16.168 [0.286] D 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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%This number is the number of distinct objets linked, by using this button, you will obtain all links (may be more than one) from that object to his children

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Identifiers (13) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

WD 1550+130 PG 1550+131 WISEA J155256.11+125443.6 Gaia DR2 1191504471436192512
ATO J238.2337+12.9121 PTF1 J155256.11+125443.9 WISE J155256.12+125443.4
CRTS J155256.0+125444 TIC 172608008 [HH95] NN Ser-9
2MASS J15525613+1254446 V* NN Ser Gaia DR3 1191504471436192512

References (274 between 1850 and 2024) (Total 274)
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


V* : 3    distance : 2    Fe_H : 1    PLX : 2    PM : 2    MK : 1   

   

Observing logs


IUE : 6   

   

External archives :

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

Link by name to the catalogue in VizieR :

WD 1550+130 2MASS J15525613+1254446 PG 1550+131 V* NN Ser WISEA J155256.11+125443.6
WISE J155256.12+125443.4 Gaia DR3 1191504471436192512 Gaia DR2 1191504471436192512

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