Comments:
1.
ASAS 090446-5625.1
TYC 8590 00384 1 = HD 302079 = ASAS 090446-5625.1
B-V = 0.452 (Tycho2), J-H = 0.159 (2MASS), Spectral type: A5.
P = 0.17544 d, DSCT/EC/ESD (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
5.69995 |
0.033 |
0.1754402 |
2453400.089 |
f2 |
5.87486 |
0.015 |
0.1702168 |
2453400.163 |
f3 |
5.57250 |
0.008 |
0.1794528 |
2453400.127 |
f4 |
9.21832 |
0.006 |
0.1084796 |
2453400.053 |
2.
ASAS 091455-6401.6
TYC 8948 00036 1 = ASAS 091455-6401.6
B-V = 0.455 (Tycho2), J-H = 0.184 (2MASS).
P = 0.154198 d, DSCT (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
6.485320 |
0.076 |
0.1541944 |
2452614.704 |
f2 |
6.720177 |
0.025 |
0.1488056 |
2452614.731 |
f3 |
6.609512 |
0.016 |
0.1512971 |
2452614.718 |
3.
ASAS 094623-3957.0
TYC 7697 03154 1 = ASAS 094623-3957.0
B-V = 0.436 (Tycho2), J-H = 0.135 (2MASS).
P = 0.152365 d, DSCT (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
6.563196 |
0.039 |
0.1523648 |
2453600.117 |
f2 |
6.228950 |
0.020 |
0.1605407 |
2453600.089 |
f3 |
6.48210 |
0.017 |
0.1542710 |
2453600.120 |
f4 |
6.99815 |
0.009 |
0.1428950 |
2453600.018 |
4.
ASAS 171022-5415.1
TYC 8598 01984 1 = HD 298732 = ASAS 095220-5414.5
B-V = 0.505 (Tycho2), J-H = 0.152 (2MASS), Spectral type: A3.
P = 0.168942 d, DSCT (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
5.919205 |
0.046 |
0.1689416 |
2453600.078 |
f2 |
5.663229 |
0.022 |
0.1765777 |
2453600.121 |
5.
ASAS 105719-5057.9
TYC 8211 01725 1 = ASAS 105719-5057.9
B-V = 0.394 (Tycho2), J-H = 0.091 (2MASS).
P = 0.048799 d, DSCT (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
20.49243 |
0.063 |
0.0487985 |
2453500.0095 |
f2 |
20.73876 |
0.017 |
0.0482189 |
2453500.0195 |
6.
ASAS 150306-6028.0
TYC 9020 00319 1 = ASAS 150306-6028.0
B-V = 0.565 (Tycho2), J-H = 0.201 (2MASS).
P = 0.152295 d, DSCT/DSCTr (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
6.56620 |
0.059 |
0.1522950 |
2453500.077 |
f2 |
7.93107 |
0.019 |
0.1260864 |
2453500.038 |
f1+f2 |
14.49727 |
0.009 |
0.0689785 |
2453500.044 |
The P2/P1 ratio (0.8279) is close to that
typical of the first and second overtone modes (P2/P1 = 0.80).
7.
ASAS 154459-6236.9
TYC 9027 02560 1 = ASAS 154459-6236.9
B-V = 0.309 (Tycho2), J-H = 0.126 (2MASS).
P = 0.130132 d, DSCT/EC/ESD (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
7.68451 |
0.042 |
0.1301318 |
2453600.039 |
f2 |
8.16955 |
0.034 |
0.1224057 |
2453600.091 |
8.
ASAS 171022-5415.1
TYC 8727 00855 1 = ASAS 171022-5415.1
B-V = 0.412 (Tycho2), J-H = 0.203 (2MASS).
P = 0.109126 d, DSCT (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
9.16355 |
0.042 |
0.1091280 |
2453500.021 |
f2 |
9.36903 |
0.034 |
0.1067346 |
2453500.064 |
f3 |
9.15744 |
0.010 |
0.1092008 |
2453500.001 |
f4 |
9.15132 |
0.006 |
0.1092738 |
2453500.036 |
f5 |
15.40360 |
0.006 |
0.0649199 |
2453500.011 |
9.
ASAS 184807-3513.7
TYC 7416 00561 1 = ASAS 184807-3513.7
B-V = 0.480 (Tycho2), J-H = 0.135 (2MASS).
P = 0.13714 d, DSCT (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
7.29154 |
0.054 |
0.1371452 |
2452796.713 |
f2 |
7.43161 |
0.023 |
0.1345604 |
2452796.701 |
The period P3=0.0821122 d (f3=12.17846 c/d)
with an amplitude of 0.008 mag is not excluded.
10.
ASAS 192226-2234.7
TYC 6875 00773 1 = HD 181719 = BD-22 5076 =
= ASAS 192226-2234.7
B-V = 0.409 (Tycho2), J-H = 0.087 (2MASS), Spectral type: F0IV.
P = 0.17751 d, DSCT/BCEP (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
5.63359 |
0.049 |
0.1775066 |
2453600.151 |
f2 |
5.28671 |
0.018 |
0.1891534 |
2453600.183 |
f3 |
4.83146 |
0.016 |
0.2069768 |
2453600.156 |
f4 |
5.43772 |
0.008 |
0.1839006 |
2453600.171 |
f5 |
5.18874 |
0.008 |
0.192725 |
2453600.028 |
11.
ASAS 201139+1606.4
TYC 1618 00812 1 = HD 355080 = NSV 12879 =
=ASAS 201139+1606.4
B-V = 0.349 (Tycho2), J-H = 0.177 (2MASS), Spectral type: F0.
P = 0.089251 d, DSCT (Pojmanski 2002).
|
Frequency, c/d |
Semi-amplitude, V mag |
Period, days |
Epoch, HJD |
f1 |
10.20135 |
0.048 |
0.0980262 |
2453900.007 |
f2 |
9.95522 |
0.036 |
0.1004498 |
2453900.080 |
Remarks:
I present an investigation of 11 known DSCT variables with small amplitudes. The
variability
of these stars was reported by Pojmanski (2002).
I re-analysed the ASAS-3 data using the period-search software developed by Dr. V.P.
Goranskij for Windows environment.
According to ASAS-3 data, the variables are multiperiodic Delta
Scuti stars. Most harmonics have low amplitudes and are probably nonradial.
References:
Pojmanski, G., 2002, Acta Astronomica, 52, 397