A star that pulsates radially, changing both diameter and temperature is called a ...

Quasars
Magnetars
Pulsars
Cepheid
A Cepheid variable is a type of star that pulsates radially, varying in both diameter and temperature and producing changes in brightness with a well-defined stable period and amplitude. A strong direct relationship between a Cepheid variable's luminosity and pulsation period established Cepheids as important indicators of cosmic benchmarks for scaling galactic and extragalactic distances.
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Answers by country

Quasars
Magnetars
Pulsars
Cepheid
answers
flagthe United States
10%
21%
38%
30%
90
flagAustralia
26%
13%
30%
30%
23
flagFrance
0%
0%
70%
30%
10
flagSwitzerland
33%
8%
25%
25%
12
flagPakistan
8%
8%
58%
25%
12
flagPoland
15%
8%
52%
22%
2062
flagIndia
21%
19%
38%
20%
99
flagGermany
21%
17%
39%
18%
128
flagthe United Kingdom
13%
13%
53%
18%
43
flagthe Philippines
27%
9%
45%
18%
11
flagAustria
16%
12%
58%
12%
31
flagGreece
10%
20%
70%
0%
10