The machine readable library as it is currently being distributed from the Astronomical Data Center is described. The library contains digital spectral for 161 stars of spectral classes O through M and luminosity classes 1, 3 and 5 in the wavelength range 3510 A to 7427 A. The resolution is approximately 4.5 A, while the typical photometric uncertainty of each resolution element is approximately 1 percent and broadband variations are  3 percent. The documentation includes a format description, a table of the indigenous characteristics of the magnetic tape file, and a sample listing of logical records exactly as they are recorded on the tape

Warren, W. H., Jr.

English

NASA Technical Reports Server

General Disclaimer 
One or more of the Following Statements may affect this Document 
 
 This document has been reproduced from the best copy furnished by the 
organizational source. It is being released in the interest of making available as 
much information as possible. 
 
 This document may contain data, which exceeds the sheet parameters. It was 
furnished in this condition by the organizational source and is the best copy 
available. 
 
 This document may contain tone-on-tone or color graphs, charts and/or pictures, 
which have been reproduced in black and white. 
 
 This document is paginated as submitted by the original source. 
 
 Portions of this document are not fully legible due to the historical nature of some 
of the material. However, it is the best reproduction available from the original 
submission. 
 
 
 
 
 
 
 
Produced by the NASA Center for Aerospace Information (CASI) 
https://ntrs.nasa.gov/search.jsp?R=19850016735 2020-03-20T19:28:40+00:00Z
L/
NOVEMBER 1984
-0 4-
Wd&A&F&^
mGP*Q1-w-qqmff%0
JVDC-A-R&S
National Spam Science Data Center/
World Date Canter A For Rocket$ and Satellites
4 19
(NASA -Th-E7438)	 E000btN7 ' IIC^I FOR THE
	 N85 - 2`_Q46
6ACHINH-FkAUELLI YEBSICN f A IIEFA6Y CF
-ST4LLAF SFICTbA (JACCEY, LUN11P ANU
..:HRISTIAH 1944) (tASA)
	 1' F EC 102jIF A41	 Uncles
CSCL 0311 G3/89 14565
I
OOCHMENTATII,il FOR THE MACHINE-REAOABLF. VERSION
nF
A LIBRARY OF STELLAR SPECTRA
i,
(JACOBY, HUNTER AND CHRISTIAN 1984)
Ll
I
I
NSSDC/WDC-A-RRS P4-11
DOCHMENTATION FOR THE MACHINE-READARLF. VERSION
OF
A LIBRARY OF STELLAR SPEOTRA
(JACOBY, HUNTER AND CHRISTIAN 1484)
IJayne H. Warren Jr.
November 1484
National Space Science Data Center (NSSDC):
World Data Center A for Rockets and Satellites (WOC-A-R&S)
National Aeronautics and Space Administration
Goddard Space Flight Center
Greenbelt, Maryland 20771
1	 ,1
f
.e
DOCUMENTATION FOR THE MACHINE-READABLE VERSION
OF
A ;ZBRARY OF STELLAR SPECTRA
(JACOBY, HUNTER AND CHRISTIAN 1984)
ABSTRACT
A detailed description of the machine-readable library as it is currently be-
ing distributed from the Astronomical Data Center is given. The library con-
tains digital spectra for 161 stars of spectral classes 0 through M and lumi-
nosity classes I, III and V in the wavelength range 3510 A to 7427 A. The
resolution is approximately 4.5 A, while the typical photometric uncertainty
of each resolution element is — 1 percent and broadband variations are < 3
percent.	 The documentation includes a format description, a table of the in-
digenous characteristics of the magnetic tape file, and a sample listing of
I	 logical records exactly as they are recorded on the tape.
p,RZCEDING PAGC I3LANIC NOT FII.D'IED
li
TABLE OF CONTENTS
SECTION 1 -	 INTRODUCTION
	 AND	 SOURCE
	 REFERENCE	 .......................... 1-1
SECTION2 - TAPE	 CONTENTS
	 .....................0 2-1
ISECTIONi 3 - TAPE	 CHARACTERISTICS	 ....................................... 3-1
SECTION 4
- REMARKS, MODIFICATIONS, ACKNOWLEDGMENT AND REFERENCE
	 ....... 4-1	 i
SECTION5 -	 SAMPLE	 LISTING	 ............................................. 5-1
LIST OF TABLES
j	 Table
1	 Tape Contents ........................................... I.........	 2-1
2	 Tape Characteristics .............................................
	
3-1
ER crmiNG P.AGI J3GANh Nor r3.N3z o
v
1-1
SECTION 1 - INTRODUCTION AND SOURCE REFERENCE
The machine-readable version of A Library of Stellar Spectra (Jacoby, Hunter
and Christian 1984) contains digital spectra of 161 stars of spectral types 0
through M and luminosity classes I, III ana V. Although two stars were chosen
for low metallicity, the library contains stars of mostly solar metallicity.
The data were obtained with the Intensified Reticon Scanner an the M1 91-cm
telescope at Kitt Peak National Observatory.
This document describes the machine version of the library as it is currently
being distributed from the Astronomical Data Center; it is intended to enable
users to read and process the data without problems and guesswork. For more
detailed descriptions of the instrumentation used to secure the spectra, the
observing program, data reduction, the combining of three overlapping spectra
to produce a single effective spectrum, interstellar reddening effects, the
library itself and possible applications of the data, the source reference
should be consulted. A copy of this document should accompany any machine
version of the library originally obtained from the Astronomical Data Center.
SOURCE REFERENCE
Jacoby, G. H., Hunter, D. A. and Christian, C. A. 1984, A Library or Stellar
Spectra, Astrophys. .7. Suppl. 56, 278.
Record 1
	1-10	 ---	 A10
	
11-17	 -	 A7
	
18-20	 ---	 3X
	
21-27	 ---	 A7
28-36
37-40
41-46
47-50
51-56
57-60
61-65
---	 9X
mag	 F4.2
---	 6X
mag	 F4.2
6X
mag
	
F4.2
5X
SECTION 2 - TAPE CONTENTS
The machine version of A Library of Stellar Spectra consists of groups of
records for each star. There are 161 groups of 352 logical records each, with
each group consisting of two header records and 350 data records containing
eight flux values each. Since all record groups are identical, Table 1 con-
tains byte-by-byte descriptions of the two header records only, plus a general
description of the remaining data records.
Table 1. Tape Contents. A Librarw of Stellar Scectra.
Su44ested
Star identification (HD, BO, SAO, mis-
cellaneous).
Adopted spectral type. The field is
reasonably uniform in that temperature
class occurs in byte 11, subclass in 12-
14, luminosity class in 15-17, but there
are a few other alphabetic characters
for peculiar types.
Blank
Spectral type taken from the literature
if different from the adopted type.
Field format is structured as in bytes
11-17.
i
i	 '.
Blank
Derived color excess, E(B-V), used to
to deredden the spectrum.
Blank
Observed U-B color, as synthesized from
the spectrum.
Blank
Observed B-V color, as synthesized from
the spectrum.
Blank
2-1
Table1
Rtes
66-70
71-76
77-BO
LconcJ uded^^
Suggested
Units	 Format
mag	 F5.2
---	 6X
---	 F4.2
w
Description
Dereddened color (U-B)0+ as derived from
the synthesized U-B.
Blank
Dereddened color (B-V)0, as derived from
the synthesized B-V.
Record 2
1- 6 --- 6X Blank
7-10 mag F4.2 U-B color taken from the literature.
Field is blank	 if no data present.
11-16 --- 6X Blank
17-20 mag F4.2 B-V color taken from the literature.
Blank if no data present.
21-23 --- 3X Blank
24-30 A F7.2 Wavelength of first pixel (always equal
to 3510.00).
31-36 --- 6X Blank
37-40 A F4.2 Wavelength increment per pixel	 (always
1.40).
41430 --- 40X Blank
Records 3-352
Data records containing eight flux values per record in format MUM.
There are 2799 pixels to be read in each spectrum.
It should he noted that the data fields in the header records were all written
as groups of 10 bytes each; thus, they can all be read, e.g., as A10 or F10.2.
The table contains exact format specifications in order to alert the user as
to which bytes are always blank and to specify the actual data ranges.
2-2
SECTION 3 - TAPE CHARACTERISTICS
The information contained in Table 2 is sufficient for a user to describe the
	 II
indigenous characteristics of the machine-readable version of A Library of
Stellar Spectra to a computer. Information easily varied from installation t;
installation, such as block size (physical record length), blocking factor
(number of logicei records per physical record), total number of blocks, tape
density, number of tracks, and internal coding (EBCDIC, ASCII, etc.) is not
included, but should always accompany secondary copies if any are supplied to
other users or installations.
Table 2. Tape Characteristics. A Library of Stellar Speoti-a.
NUMBEROF FILES ................................................... 	 1
LOGICALRECORD LENGTH (BYTES) ..................................... 	 80
RECORD FORMAT	 *
TOTALNUMBER OF LOGICAL RECORDS ...................................
	
56672
* Fixed block length (last block may be short)
3-1
SECTION 4 - REMARKS, MODIFICATIONS, ACKNOWLEDGMENT AND REFERENCE
The magnetic tape version of A Library of Stettar spectra was received on mag-
netic tape from Dr. George H. Jacoby on 26 April 1984. As received, each
spectrum contained 360 logical records, the last eight of which were blank.
The blank records were deleted to conserve storage space. In addition, name
fields were examined and certain ones modified to effect a more uniform
presentation (e.g,, the catalog numbers were aligned). No other changes have
been made to the original data.
ACKNOWLEDGMENT
Appreciation is expressed to G. H. Jacoby for supplying the original magnetic
tape of the library and for sending a preprint of the published paper. Dr.
Jacoby also kindly reviewed and commented on a draft copy of this document be-,
fore its final printing for distribution with the machine version of the
library.
REFERENCE
Jacoby, G. H., Hunter, 0. A. and Christian, C. A. 1984, A Library of Stettar
Spectra, Aetrophys. J. suppt, 56, 278.
4-1
SECTION 5 - SAMPLE LISTING
The sample listing given on the following pages contains logical data records
exactly as they are recorded on the tape. Groups of records from the begin-
ning and end of the library are illustrated. The beginning of each record and
bytes within the record are indicated by the column heading index across the
top of each page (digits read vertically).
41
5-1
g
ON
N
H
M M
r	 o
r O O
In m qU
6
o W	 a
paN H No
vW H
W
a
H
W
W
a
a
N
O
a
W
to
A
94
O
v
W
a
w
0
C7
z
H
H
N
H
a
MoMCA
 M
m h
m MMNM rM o
N mm
C%3 to
N^
N NN r
mP coP{\
r ID
r In
ryP Mr NP r
P m
co
toh
vMNP
W
zz
MHx
PCaW
.3 CC=
094z
W=H
,►
	 I
.. rin
rry
r rrP,
O	 P P P r P P P
I	 N M M n N m
m w m m n In	 ^o
N N N N N N N
P	 P P P P P PP	 P P P P P P P
i	 v^ w W o .W- m
m N m m ^^ b
N N iV N N N N
m	 r r r	 r r
N	 W W W W W W W
vm m a ^ n n to
m m m m t^ m m
N N N N N N N
[^	 r r 
y
r
^^ 
r r P
^/	
W W W 1+ N 0 %D
	
W N 1M N M	 b
N N N N N N N
O O r
	
r r r r rW V' r r r r	 r
	
I	 I	 I	 1	 I	 1	 I
w w w w w w w
O n n o w v com m m m m I. m
N N N N N N N
	
OO P	 P	 r r r
	
r r
	
r r
 1	 I 	 1	 1	 1
°
41
3 owi 
o C 14 N rn v
	
u1 m	 N M o v MM m m m m m t^ u1
N N N N N N N
m r r r r r r r
.^. N W W W IN7^ W W W
r m N m; w N
m m m m m n In
C	 N N N N N N NN r r r r r r r
N ^ ^ N ^ 4 O o N
Q
	
N N N N N N N
I N M v m w P m m
Iar 
r r r r r r r
N N W W W W W Wo ^o r m o
in in v v W N v V
N N N N N N N N
r r r r r
	
r r
^ 4II^7 1	 I	 I	 1^aI7 	 I	 I
M h o owo b N M N
Itn v u1 v N m v M
N N N N N N N N
r r r r r r r r
W W I1I^n W W W W ryW
m N M M M	 n N
m v m v m o v v
N N N N N N N N
r r r r r r r r
N W	 W W W W W
o N r W r n N co
In v In v u1 vl v v
N N N N N N N N
r r r r w r rr	 r r P	 r
1 i l
	 l	 l i i 1
to M co Omi	 m N N
v In v v v In v w
N N N N N N N N
r	 r w r r rr r ^- r r r r r
o Mm M r m {^ro r
In Ln ZT u1 v m v v
N N N N N N N N
r r
	
w r
m Or (+P7 a m 0 W
Ln Z°o v Ij m ^ v v
N N N N N N N N
r r r P P r ' P r
M^ v W v W n n
m m o m o m t^ v
m In In v cn .o v v
N N N N N N N N
N	 v In ^o n m	 m oP P
	 P r r P P	 P N
P
W
vM
N
WMNM
N
W
vM
N
W
N
N
r
w
m
vM
N
w
b
M
N
WM
v
N
i
w
in
v
v
N
pa R p 2 9 2 pa 9 2 pa pa 2 m@ 9a 2 2 2 pa R0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
I
mN
m o N N N N N N N N N N N N N N N N N N NN O. r r r r 'r r r r r r r r r r r r r
n w 1 I I 1 I I I I I I I 1W I I I 1 I I 1n n
n.0 W tit WM W WN WW Wr W W W W 1+1 W W
ar 7 W W W
Kin  m M 0 r N M n n ^ M n o 0 o
M
M W N N
nM ID N W N ID N N N N N ^ v I+1 V' N V v M NNN r r r r •- r n r r r r .^ n r r r r r r
^ o N N N N N N N N N N N N N N N N N N N NWCT r r n r r n r r r r r r r r n r r
Wt0 1 I I I I I I I I I I 1 I I I I 1 I I I
.D In W W W W W RI W W W W w W W W W W W W W WW W r v co O M M W M N Da ID N O OW N N o Nn MDa 0O 0o NN n N N v .0 v r v ID wtD N 0oID v W W W N W .D N N N N N cT N Ill N V v,- M N ^T
MW1DN r r r r r r r r r r r r r r r r r r r r
IWD o N N N N N N N N N N N N N N N N N N N NNm r r r r r r r r r r r r r r r r r r r r
Nt0 1 I 1 I I I. I I I I I I 1 I 1 I I I I IN n w (^ w w w W ^lya7^ (1^D w w w w w w w w (1 D7 w wN .D o N N M n .0 N I!1 N M r T w M m C. w N
fn v b b In1 b N 0 m M N Ln to m try m N v w M v v
N M r r r r r r^ r r r r r r r r r r r r r rLn^N o N N N N N N N N N N N N N N N N N N N NvO. r r r r r r r r r r r r r r r r
V W I I 1 I I 1 1 1 1 I 1 I I I I 1 I I I I
vn w W w w W w W w W w w +^7 w w w W w w w w
^T ID O. n V' ro o O cV .O ^T O 0 M n M .D co .o c0 ^T
vN O n N N n v m N ID n LT o v W O n vv V' ID IO V N N ID0 N ^T N N MN OTV N N N V' 1 7 W V' v
^T M7 r ^- r r ^ r r r r r r r r r r n r r r .^
v o N N N N N N N N N N N N N N N N N N N NMN r r r r r r r r n r r r r r r r r
M W 1 I 1 I I 1 I I 1 I t I I I I I I I I 1M n W W W W W W W W W W W f+ +1 W W ^7 {N+ W W W
MID D1 M 1T OI O n O N D1 c0 0. O O Oa M
M V ^ n v 1Ot1 W W v V W N N N N in v V w v v v
M MM N r r r n r .- r r" r r _ r r r r r r r n
M o N N N N N N N N N N N N N N N N N N N NNN I n n r r r n r n r r I n n n r
Nc0 I 1 1 I I 1 I I I I 1 I I I I I 1 I I IN n W W W W W W W W W W W W W W W W w W W W
N.D M r r 0 n o o D• w O N m o W 0 M v oN N n cQ M N c0 N O. W N W .P ^T P M n n W v M nNAT ID n h N W N M .T N •T N W V 6n Zr v v v v v
NN r r n n r r r r n n n r r T r r r n r r
N o N N N N N N N N N N N N N N N N N N N N
co i i
i
ri i• i i i i i i
i'
i i
rn (+ w w w w w w w w ^a w w w w . w w w w w wn.D o N r o r N W 0 r M W M o 0 r ID 0
^ W.n- v W t, 1D M M M W ''-I 1n11 M N M v v v W v v
rM • . . . . . . . . . . . . . . . . .rN r r r ^- r r r r r r r r r r r r n r .^ r
o N N N N N N N N N N N N N N N N^ N N N N(Y% r r r r n r r r r r r r r r r r
co 1 1 I I t I I I 1 I I I I 1 I I I I I 1
n w w w w w w w w w w w w w w w w w w w wW N .D W O v o 0 M N N M M
N M N O n 10 0 0 M w M M 0 O r n v w n D\
M W W
W N N N v N N N cT N N N v W v -T M N
N
r
r r r r r r r r r r r r r r n r r r r r
M V' N W n t0 O^ o r N M ^T N ID n m O. O NC7 N N N N N N N ID IO W ID .D .D. W W W W n h nIO 10 W W W
x 2
w w w 0 0 0 w
I+WI
0 w w
IW
0 w w w w
h IWn N h N m h IWl1 IWn m I+WI (1 m in m m m IW/l m
=HM
gq qq qq pp o
W 9w g q O9w q 9w q9a pa p9a g q qa qq
q
..i¢P 0a 00 00 W0 0 as0 0 00 00 0 00 0 0 0 0 W0 00 0 00 00
o W Z µU77 1[aa^^^ (c ^77 µU1^77 ^1Uaa77 lU^^ 1aU{^^ WU µ0{^7 {cyy7 yU^ Ia0a77 1aUa^^ {cyD^^ 1c ^77 1U^77 u (0(^^77 UFj
{c+
U W H PG P4 G4 P4 OG f>+ ai i>: fX ai [L f>: L>: f>: K. W. L5 CG
i1
I
W
a
H
w
W
a
4
F
N
b
ID
N
H
M	 fA o
N n O O
.D N !p UW
N
O w	 a
µµ77
	 .7
K. W
C U
W H
£
O
a
w
N
P
a
0
U
W
!Y.
w
O
tD
z
H
H
N
H
a
rrN
r r v
r r
rnrrr
rrO
rO0.
rOW
rO nr O.D
r O N
rov
°oN
I	 a


Documentation for the machine-readable version of A Library of Stellar Spectra (Jacoby, Hunter and Christian 1984)

Abstract

Similar works

Full text

Available Versions

NASA Technical Reports Server