Post-AGB Objects Catalogue -- Info

Information on symbols and units used

Other Name

The Other Name is either the usual name or the designation in one of the following main catalogues (in order of preference):

General Catalogue of Variable Stars
LS or LSE
BD
CD catalogues
any other name deemed appropriate (if none of the above main catalogues has info about the object)

Spectral Type

For the vast majority of sources the Spectral Type is derived from the Simbad database. The

icon indicates objects for which this is not the case. Keeping the mouse positioned on the icon for 2-3 seconds pop-ups a yellow box with more detailed information.

Bibliography

The Bibliography column gives the following information :

ADS - link to the ADS abstract service. The link opens an ADS page with a list of publications which refer to the object.
all other links - id's of selected publications. When clicked, a DOI: or Bibcode (via adsabs) name resolver will be called, and a link to an electronic version of the publication will be shown. note: the availability of the full text version of the publication may be limited to the journal(s) subscribers only.

SED Diagrams

The following formulae are used to derive diagram data point coordinates :

Tycho2 BT X[um] = 0.435 Y[Jy] = 4000.0 * 10^(-0.4 * Mag) Tycho2 VT X[um] = 0.505 Y[Jy] = 3700.0 * 10^(-0.4 * Mag) GSC2 R X[um] = 0.70 Y[Jy] = 2850.0 * 10^(-0.4 * Mag) GSC2 B X[um] = 0.44 Y[Jy] = 4270.0 * 10^(-0.4 * Mag) GSC2 V X[um] = 0.55 Y[Jy] = 3900.0 * 10^(-0.4 * Mag) Denis I X[um] = 0.82 Y[Jy] = 2499.0 * 10^(-0.4 * Mag) Denis J X[um] = 1.25 Y[Jy] = 1595.0 * 10^(-0.4 * Mag) Denis K X[um] = 2.15 Y[Jy] = 665.0 * 10^(-0.4 * Mag) 2MASS J X[um] = 1.235 Y[Jy] = 1594.0 * 10^(-0.4 * Mag) 2MASS H X[um] = 1.66 Y[Jy] = 1024.0 * 10^(-0.4 * Mag) 2MASS K X[um] = 2.16 Y[Jy] = 666.7 * 10^(-0.4 * Mag) MSC6X A X[um] = 8.28 Y[Jy] = Jy MSC6X C X[um] = 12.13 Y[Jy] = Jy MSC6X D X[um] = 14.65 Y[Jy] = Jy MSC6X E X[um] = 21.34 Y[Jy] = Jy IRAS Fnu12 X[um] = 12 Y[Jy] = Jy IRAS Fnu25 X[um] = 25 Y[Jy] = Jy IRAS Fnu60 X[um] = 60 Y[Jy] = Jy IRAS Fnu100 X[um] = 100 Y[Jy] = Jy

Only "good" photometric data are plotted, that is no upper limits, from GSC2, TYCHO-2, 2MASS, DENIS, MSX6C, IRAS catalogues. Specifically, data points with the following quality flags are excluded from the plot :

IRAS: qualityflag = 1
2MASS: qualityflag = E/X/U/F
MSX6C: qualityflag = 1

To obtain the SED in Jy, click on SED [Jy] link, to obtain the SED in erg cm^-2 s^-1 click on SED [erg cm^-2 s^-1].

Spectroscopic Data

ISO: - when available, an ISO spectrum is overplotted on the SED diagram. The ISO observation identifier from which data were taken is given in the TDT field. Details on how the ISO spectra were processed, are given to the catalogue's official reference.

IRAS: Low Res Spectrum - when available a low resolution IRAS spectrum is overplotted on the SED diagram. The spectrum has the absolute calibration corrected as in Volk and Cohen (1989; Astron.J., 98, 1918) and Cohen, Walker, and Witteborn (1992; Astron.J., 104, 2030). The data points are taken from http://www.iras.ucalgary.ca/~volk/getlrs_plot.html using corrected raw text format.

Photometric Data

HD: Ptm Ptg - Photovisual & Photographic magnitude in HD catalogue

HD(Nesterov): Ptm Ptg - Photovisual & Photographic magnitude in HD(Nesterov) catalogue

SAO: P V - Photographic & Visual magnitude in SAO catalogue

GSC: P err - photographic magnitude & Mean error on photographic magnitude in The HST Guide Star Catalog, Version GSC-ACT

GSC2: R e_R B e_B V e_V - Magnitude in F photographic band (red) & Mean error on Rmag & Magnitude in J photographic band (blue) & Mean error on Bjmag & Magnitude in V photographic band (green) & Mean error on Vmag in The GSC 2.2 Catalogue

TYCHO-2: BT e_BT VT e_VT - Tycho-2 BT magnitude & error of BT & Tycho-2 VT magnitude & error of VT in The Tycho-2 Catalogue. Approximate Johnson photometry may be obtained as:

V = VT - 0.090 * (BT - VT) B-V = 0.850 * (BT - VT)

IRAS: Fnu_12 Fnu_25 Fnu_60 Fnu_100 qqqq - Average non-color corrected flux density, 12um & Average non-color corrected flux density, 25um & Average non-color corrected flux density, 60um & Average non-color corrected flux density, 100um & Flux density quality in each band

2MASS: J H K Qflg - J selected default magnitude & H selected default magnitude & K selected default magnitude & JHK Photometric quality flag in 2MASS All-Sky Catalog of Point Sources. Three character flag, one character per band [JHK], that provides a summary of the net quality of the default photometry in each band, as derived from the Read Flag (Rflg), measurement uncertainties ([jhk]cmsig), scan signal-to-noise ratios ([jhk]snr), frame-detection statistics (Ndet), and profile-fit reduced chi-squared values ([jhk]psfchi). The value for Qflg is set for a band according to the precedence of the table below. For example, a source that is tested and meets the conditions for category "X" is not tested for subsequent qualities.

X - There is a detection at this location, but no valid brightness estimate can be extracted using any algorithm. Rflg="9" and default magnitude is null.
U - Upper limit on magnitude. Source is not detected in this band (Rflg="0"), or it is detected, but not resolved in a consistent fashion with other bands (Rflg="6"). A value of Qflg="U" does not necessarily mean that there is no flux detected in this band at the location. Whether or not flux has been detected can be determined from the value of Rflg. When Rflg="0", no flux has been detected. When Rflg="6", flux has been detected at the location where the images were not deblended consistently in all three bands (JHKs).
F - This category includes Rflg="1" or Rflg="3" sources where a reliable estimate of the photometric error, [jhk]cmsig, could not be determined. The uncertainties reported for these sources in [jhk]cmsig and e_[jhk]mag are flags and have numeric values >8.0.
E - This category includes detections where the goodness-of-fit quality of the profile-fit photometry was very poor (Rflg=2 and [jhk]psfchi>10.0), or detections where psf fit photometry did not converge and an aperture magnitude is reported (Rflg=4), or detections where the number of frames was too small in relation to the number of frames in which a detection was geometrically possible (Rflg="1" or Rflg="2").
A - Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with [jhk]snr>10 AND [jhk]cmsig<0.10857.
B - Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with [jhk]snr>7 AND [jhk]cmsig<0.15510.
C - Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with [jhk]snr>5 AND [jhk]cmsig<0.21714.
D - Detections in any brightness regime where valid measurements were made (Rflg="1","2" or "3") with no [jhk]snr OR [jhk]cmsig requirement.

MSX6C: A C D E q_A q_C q_D q_E - Flux density in A (8.28um) band & Flux density in C (12.13um) band & Flux density in D (14.65um) band & Flux density in E (21.34um) band & Band A quality & Band C quality & Band D quality & Band E quality. The Quality flags in each band are:

4 = excellent, SNim >= 10.0
3 = good, 7.0 <= SNim < 10.0 or SNim = -800 and SNpsx >= 10.0
2 = fair, 5.0 <= SNim < 7.0 or SNim = -800 and 5.0 <= SNpsx < 10.0
1 = limit, SNim < 5.0

DENIS: I e_I J e_J K e_K - Magnitude in I band from PSF fit & Magnitude error in I band from PSF fit & Magnitude in J band from PSF fit & Magnitude error in J band from PSF fit & Magnitude in K band from PSF fit & Magnitude error in K band from PSF fit in The DENIS database