Example sentences of "[num] and a period of " in BNC.

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1 Zeta is an Algol-type eclipsing binary , with a range of from 3.6 to 4.1 and a period of 1.67 days ; suitable comparisons are Eta ( 4.4 ) , Delta and Chi Eridani ( 3.7 ) .
2 Delta Libræ is an Algol-type eclipsing binary , with a range of from 4.8 to 6.1 and a period of 2.33 days .
3 Finally there is the Cepheid variable T Vulpeculæ , with a range of from 5.4 to 6.1 and a period of 4.4 days .
4 One is Eta , a semi-regular star with an official range from magnitude 3 to 3.9 and a period of around 233 days .
5 It is fairly rich , and is an easy binocular object ; it contains the Cepheid variable S Normæ , which has a range of from 6.8 to 7.8 and a period of 9.7 days .
6 Then followed the crash of 1987 and a period of lacklustre performance .
7 Lambda Tauri is an Algol-type eclipsing binary , with a range of from 3.3 to 4.2 and a period of 3.9 days .
8 The other bright variable is Zeta , a typical Cepheid with a range of from 3.7 to 4.3 and a period of 10.2 days .
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