Se informa el descubrimiento de ocho estrellas australes con emisión en HαAsociación Argentina de Astronomí

Kucewicz, B.

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Southern B-type stars with emission at H-alpha
Boris Kucewicz 
Observatorio Astronómico - La Plata
Resumen: Se informa el descubrimiento de ocho estrellas aus­
trales con emisión en H&
Several years ago a program was started for the search 
of H-alpha emission in early type stars. It was decided to 
observe all stars of the “Bright Star Catalogue” south of 
the equator, falling in the spectral range O-AO. All observa- 
tions were made with the 2 prism spectrograph attached to 
the 32” La Plata reflector. A camera giving a reciprocal 
o
dispersión of 180 A/mm at H-alpha was used. The total 
number of stars in the program is 1454 of which 1219 were 
already observed. Pardal results of the survey were published 
already. (Jaschek, Jaschek and Kucewicz 1962; Kucewicz 
1963; Jaschek, Jaschek and Kucewicz 1964; Kucewicz 1965; 
Kucewicz 1967). The purpose of the this note is to announce 
eight new emission line objects found among the last 318 
stars observed, which correspond mainly, although not cx- 
clusively to the spectral range B5-A0.
The main results are contained in table I.
The first two columns provide the star identifications. 
The third. fourth and fifth give the visual magnitude, spec­
tral type and radial velocity as taken from the “Bright Star 
Catalogue” (Hoffleit, 1964) # The last four column refers 
finally to the emission line. The sixth column gives the 
Julián date of the observation, the seventh the radial velo­
city of the H-alpha line, the next to last the width oí the 
emission, in Km/sec and the last a visual estimate of the 
line intensity. The scale for this estimate is s = strong; 
m = médium and w = weak.
TABLE I
New emission line stars
HR HD m Sp.t. V J.D. V
2430000+
a W Int.
2501 49131 5.79 B3V + 17? 10968 + 21 310 m
2656 53240 6.44 B8 + 23 11358 + 29 210 s
3022 63215 5.88 B9 -|- 28 11038 — 197 320 w
4147 91619 6.14 B5Ia + 7 11074 + 23 650 w
4169 92207 5.46 AOIa — 12 11062 + 57 330 ni
4250 94367 5.25 AOIa — 23 11056 — 166 450 w
4262 94650 5.98 B8 11376 •— 12 440 w
4438 100198 6.36 AOIa 11082 + 55 340 ni
I would like to express my thanks to Dr. C. Jaschek 
who suggested this observing program.
BIBLIOGRAPHY
C. Jaschek, M. Jaschek and B. Kucewicz, 1962, Bol. Asoc. Arg. de 
Astr. 4, 37.
B. Kucewicz, 1963, Publ. Astr. Soc. Pac. 75. 192-
G. Jaschek, M. Jaschek and B. Kucewicz, 1964, Zeitsch. f. Astroph. 
59, 108.
B. Kucewicz, 1965, Bol. Asoc. Arg. de Astr. 10, 63.
B. Kucewicz, 1967, Information Bulletin for the Southern Hemis- 
phere, 11, 34.
Boj,. N9 18 - Asoc. Aro. de Astr.
10


Southern B-type stars with emission at H-alpha

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Southern B-type stars with emission at H-alpha

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