II/257A A Finding List of Faint UV-Bright Stars (Lanning+, 1973-2004)
A Finding List of Faint UV-Bright Stars in the Galactic Plane.
Lanning H.H.
<Publ. Astron. Soc. Pac. 85, 70 (1973)>
=1973PASP...85...70L 1973PASP...85...70L
A Finding List of Faint UV-Bright Stars in the Galactic Plane II.
Lanning H.H., Meakes M.
<Publ. Astron. Soc. Pac. 106, 38 (1994)>
=1994PASP..106...38L 1994PASP..106...38L
A Finding List of Faint UV-Bright Stars in the Galactic Plane III.
Lanning H.H., Meakes M.
<Publ. Astron. Soc. Pac. 107, 751 (1995)>
=1995PASP..107..751L 1995PASP..107..751L
A finding list of faint UV-bright stars in the Galactic plane. IV.
Lanning H.H
<Publ. Astron. Soc. Pac. 110, 586 (1998)>
=1998PASP..110..586L 1998PASP..110..586L
A finding list of faint UV-bright stars in the galactic plane. V.
Lanning H.H., Meakes M.
<Publ. Astron. Soc. Pac. 112, 251 (2000)>
=2000PASP..112..251L 2000PASP..112..251L
A finding list of faint UV-bright stars in the galactic plane. VI.
Lanning H.H., Meakes M.
<Publ. Astron. Soc. Pac. 113, 1393 (2001)>
=2001PASP..113.1393L 2001PASP..113.1393L
A finding list of faint UV-bright stars in the galactic plane. VII.
Lanning H.H., Meakes M.
<Publ. Astron. Soc. Pac., 116, 1039 (2004)>
=2004PASP..116.1039L 2004PASP..116.1039L
ADC_Keywords: Galactic plane; Photometry, UBV; Surveys ; Ultraviolet ;
Blue objects
Description:
The survey lists the very blue objects found on the plates taken for
the Sandage Two-Color Survey of the Galactic Plane obtained using the
Palomar 48 inch Oschin Schmidt telescope. The sources range in U-B
color from U-B~-0.1 to U-B~-1.0 and in magnitude from mB∼10 to ∼20.
Introduction (by Nancy G. Roman):
The Sandage two-color photographic survey was originally made in
support of the UHURU X-ray satellite in order to identify those
optical counterparts of the detected X-ray sources found in the
galactic plane. During inspection of the plates, however, many
UV-bright objects fainter than 10th magnitude were seen in the general
field. A larger image in the U filter suggested the possibility of a
bluer object as in the case of low-luminosity stars, white dwarfs,
novae, CVs, normal early B stars, etc. As these are interesting in
themselves, it was decided to publish a catalog for the use of other
observers. This multi-color photographic technique has been described,
for example, by Haro and Herbig (1955BOTT...12...33H 1955BOTT...12...33H).
The survey was concentrated on objects with m(B)∼10 or fainter. It
employed the Palomar 48-in (Oschin) Schmidt telescope and was centered
on the galactic plane with overlapping regions covering the galactic
latitudes ±9 degrees, and extending throughout most of the northern
plane (l=0-227°). Plates were taken by J. Kristian, A.R.
Sandage, R.J. Brucato, and Lanning, primarily.
The data presented here were found following a careful examination
of the plates but it should not be assumed these data represent a
complete survey of the fields examined.
The categories were roughly calibrated against photoelectric (U-B)
measures, but a full scale calibration program, including magnitude
effects, etc. was not done. The numerical (U-B) limits of the tables
should not therefore be taken precisely.
The blue magnitude of the sources in the finding list has been
estimated using these photoelectric values as a guide but should be
considered accurate to only ±0.5mag due to the difficulty of
adjusting to the various plate characteristics. Positions were
measured from images retrieved from the Space Telescope Science
Institute collection of Guide Star digital plate scans. The accuracy
of positions from the Guide Star Catalog images has been estimated to
be on the order of 0.2-0.8arcsec (Russell et al. 1990AJ.....99.2059R 1990AJ.....99.2059R)
Information provided by Bidelman (private communication) resulted in
the discovery that 15 positions for objects listed in Paper II were in
error. Investigation indicated that an incorrect header was associated
with the scan of the Guide Star plate originally archived onto optical
disk. The incorrect astrometric solution, based on the use of an
incorrect origin point, was subsequently applied in the positional
determination when centroiding the object. The average offset for
positions in right ascension is 14.17 seconds of time, with no
detectable trend in the numbers. The offsets in declination range from
+6.56 arcseconds through zero to -6.85 arcseconds as one progresses
from west to east across the plate. This is consistent with a rotation
being introduced into the bad plate solution. Objects with incorrect
positions included Lanning 96, 97, 98, 99, 100, 102, 104, 108, 111,
113, 114, 115, 116, 119, and 122. the file lanning.dat contains the
corrected coordinates.
Description of version 'A' (B. Skiff, 20 June 2012):
Improved coordinates and magnitudes are given for the 734 Lanning
UV-bright stars. The positions were occasionally inconsistent and the
magnitudes were rather poor. the coordinates should now good to a few
tenths of an arcsecond, and the V magnitudes good to ± 0.3 mag or
so. The reported magnitudes were commonly up to 3 magnitudes off, with
the general trend of being too bright at the bright end, and too faint
at the faint end.
All but the very brightest stars were examined on DSS, 2MASS, and
Sloan images, and numerous (mostly small problems) were found with
the identifications and mismarked charts. Some new Lanning double-
identities were found, and additional extragalactic objects were
identified. In the middle lists of the series, the coordinates were
systematically off by 2"-4". It seems also that a few typos crept into
the on-line file. Also, the chart for Lanning 676 does not match the
sky at the nominal coordinates, so that object appears to be lost for
now. All this is commented upon in the table "lanning.dat"
A lot of the stars are quite blue in the visible, but persist in
near-IR images, meaning they must have cool companions. Other stars
were less obvious, and it seems many must be just ordinary stars, or
result from infelicitous overlaps on the two-image plates.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
lanning.dat 112 734 The stars with strong UV images (version 2012)
notes.dat 80 399 Notes on individual stars
annex.dat 58 308 Short notes and Sandage plate number for some
stars (paper V-VII only)
lan-ori.dat 58 734 Original version of the Lanning file (2006)
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Byte-by-byte Description of file: lanning.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [Lan]
5- 7 I3 --- Lan [1,734]+ Lanning number (G1)
13- 14 I2 h RAh Hours of Right Ascension (J2000)
16- 17 I2 min RAm Minutes of Right Ascension (J2000)
19- 23 F5.2 s RAs Seconds of Right Ascension (J2000)
25 A1 --- DE- Sign of declination
26- 27 I2 deg DEd Degrees of declination (J2000)
29- 30 I2 arcmin DEm Minutes of declination (J2000)
32- 35 F4.1 arcsec DEs Seconds of declination (J2000)
37 A1 --- s Source of position (1)
40- 43 F4.1 mag Vmag ? Approximate blue magnitude
48-112 A65 --- Remarks Remarks, by B. Skiff
--------------------------------------------------------------------------------
Note (1): sources are:
A = USNO-A2.0 i(Cat. I/254), used only when that catalogue centers
more accurately on the blue target
B = Bordeaux meridian circle (Cat. I/300)
C = Carlsberg meridian circle (Cat. I/304)
L = Lepine & Shara LSPM (Cat. I/298)
M = 2MASS (Cat. II/246)
S = SDSS-DR7 (Cat. II/294) (by preference), or DR8 (Cat. II/306)
T = Tycho-2 (Cat. I/259)
U = UCAC2 (Cat. I/289) (by preference), or UCAC3 (Cat. I/315)
north of +50°
W = WISE (Cat. I/311); for uncrowded PNe, WISE centers accurately
on the dust emission of the nebulae --- valuable when the central
star cannot be measured directly
b = USNO-B1.0 (Cat. I/284)
g = GSC-2.3 (Cat. I/305)
s = B. Skiff estimate, mainly for crowded stars where the
regular catalogues are skewed
- = "other", should be specified in the notes
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Byte-by-byte Description of file: notes.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Lan [1,734]+= Lanning number (repeated when
text longer than 76 characters)
5- 80 A76 --- Text Text of Note
--------------------------------------------------------------------------------
Byte-by-byte Description of file: annex.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Lan [353,734]+= Lanning number
5- 11 A7 --- San Sandage Plate ID
13- 58 A46 --- Text Notes about Corresponding IDs, Spectral Type,
U-B Magnitude
--------------------------------------------------------------------------------
Byte-by-byte Description of file: lan-ori.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 I3 --- Lan [1,734]+ Lanning number (G1)
4 A1 --- n_Lan [*] indicates a note in notes.dat
6- 7 I2 h RA06h Right Ascension, original version (J2000)
9- 10 I2 min RA06m Right Ascension, original version (J2000)
12- 16 F5.2 s RA06s Right Ascension, original version (J2000)
18 A1 --- DE06- Sign of declination
19- 20 I2 deg DE06d Declination, original version (J2000)
22- 23 I2 arcmin DE06m Declination, original version (J2000)
25- 29 F5.2 arcsec DE06s Declination, original version (J2000)
32- 36 F5.2 mag Bmag ? Approximate blue magnitude
37 A1 --- u_Bmag : indicates B is uncertain
39- 42 F4.1 mag U-B ? Approximate U-B color index
43 A1 --- u_U-B : indicates U-B is uncertain
44- 49 F6.1 mas/yr pmRA ? Proper motion along right ascension
(paper VII only)
51- 56 F6.1 mas/yr pmDE ? Proper motion along declination
(paper VII only)
58 A1 --- Anx [a] Note in annex.dat file (paper V-VII only)
--------------------------------------------------------------------------------
Global Notes:
Note (G1): The Lanning numbers were defined in the papers:
Paper I (1973PASP...85...70L 1973PASP...85...70L) numbers 1- 82
Paper II (1994PASP..106...38L 1994PASP..106...38L) numbers 83-135
Paper III (1995PASP..107..751L 1995PASP..107..751L) numbers 136-195
Paper IV (1998PASP..110..586L 1998PASP..110..586L) numbers 196-351
Paper V (2000PASP..112..251L 2000PASP..112..251L) numbers 352-459
Paper VI (2001PASP..113.1393L 2001PASP..113.1393L) numbers 460-572
Paper VII (2004PASP..116.1039L 2004PASP..116.1039L) numbers 573-734
--------------------------------------------------------------------------------
History:
* 10-Feb-1997: Papers I, II and III (Lanning numbers 1-195)
prepared by Nancy G. Roman (ADC/GSFC) [Catalog II/212]
* 07-Aug-1998: Paper IV appended (Lanning numbers 196-351) at CDS
[Catalog II/212A]
* 15-Nov-2000: Paper V appended (Lanning numbers 352-459) at CDS
[Catalog II/231]
* 30-Jul-2006: Papers VI & VII appended (Lanning numbers 460-734)
* 25-Aug-2006: Position of Lan 533 was corrected (from author)
* 20-Jun-2012 (version 'A'): Positions, magnitudes revised by
B. Skiff (Lowell Obs.)
* 16-Jan-2013 (from B. Skiff): Lanning 384 was discovered to be a
quadrupolar planetary nebula (Guerrero et al. 1301.3149;
fixed comment in file "lanning.dat"
Acknowledgments:
The original author would like to thank Dr. R. J. Brucato for his
assistance in the examination of some of the photographic plates for
this two-color survey. Lanning and Meakes are very grateful to Dr.
Peter Pesch for providing information regarding his unpublished
observations of the high latitude sources noted in the text. They give
special thanks to Dr. Allan Sandage for the opportunity to continue
this survey. They also extend a special thanks to Dr. W. P. Bidelman
who provided useful comments and information regarding the sources.
They also greatly appreciate the ground-based observations taken by
Dr. Alan Shafter (SDSU) and IUE data obtained by Dr. Al Schultz
(CSC/STScI) in clarifying the classification of Lanning 185.
Nancy G. Roman thanks Dr. Lanning for his help and particularly for a
careful review of the files (Feb. 1997, corresponding to papers I-III)
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(End) N.G. Roman [ADC]; F. Ochsenbein, P. Vannier, J. Marcout [CDS] 30-Jul-2006