COMMISSION 27 OF THE I. A. U.
         INFORMATION BULLETIN ON VARIABLE STARS
                     Number 1666

                                     Konkoly Observatory
                                     Budapest
                                     1979 August 27



           HO TELESCOPII: LIGHT ELEMENTS



       The variability of HO Tel was discovered by Strohmeier,
Knigge and Ott (1965).They published three times of minimum and
gave the first light elements. Spoelstra and van Houten (1972)
derived from five-colour photometry four times of minimum and have
found that the period is about twice that obtained by Strohmeier
et al. Spoelstra and van Houten's light elements are based on
minima covering 287.5 cycles. In this note we present four times
of minimum light determined from 271 UBV observations obtained
at the Bosque Alegre Station of Cordoba Observatory with the
1.54 m telescope. The photoelectric minima are now extended to
a range of 2464.5 cycles. Our observations confirm the period as
derived by Spoelstra and van Houten. In Table I are listed all
                               
                        Table I
---------------------------------------------------------
Min.   Hel.J.D.         E       (O-C)   (O-C)' References
       2400000+                
---------------------------------------------------------
I      38560.513     -2514.0   +0.021               1
II     38585.476     -2498.5   -0.019               1
I      38636.312     -2467.0   +0.004               1
II     38982.31713   -2252.5   -0.0016  0.0000      2
I      38986.34941   -2250.0   -0.0021 -0.0004      2
II     38990.38201   -2247.5   -0.0022 -0.0006      2
II     39024.25845   -2226.5   -0.0010 +0.0006      2
II     42274.6591    - 211.5   -0.0042 -0.0043      3
I      42275.4759    - 211.0   +0.0060 +0.0060      3
II     42574.7020    -  25.5   +0.0014 +0.0012      3
I      42957.8107    + 212.0   -0.0020 -0.0024      3
--------------------------------------------------------

References:  1.. Strohmeier et al.(1965); 2. Spoelstra and  van
Houten (1972); 3. Present note.

known minima. A least squares solution gives the following linear
light elements:

       Min.I= Hel.J.D. 2442615.8348 + 1.6131037d * E
                            +-.0051  +-.0000027

for all minima, while from photoelectric observations only we
found

       Min.I= Hel.J.D. 2442615.8350 + 1.6131045 * E,
                            +-.0016  +-.0000010

which has smaller m.e.'s and residuals (O-C)' as compared with
(O-C) from the elements including the first three photographic
minima.



                        R.F. SISTERO
                        B.A. CANDELLERO
                        Observatorio Astronomico
                        Laprida 854, 5000 Cordoba
                        Argentina




References:          
Spoelstra, T.A.Th. and van Houten, C.J., 1972, Astron.Astrophys.
       Suppl. 7. 83 [BIBCODE 1972A&AS....7...83S ]
Strohmeier, W., Knigge, R. and Ott, H., 1965, I.B.V.S. No. 81