Which of the Following Is NOT an Argument for Cygnus

question 92

Multiple Choice

Which of the following is NOT an argument for Cygnus X-1's being a true black hole?

• A)Spectroscopic data suggests hot gas is flowing from the companion B star onto Cygnus X-1.
• B)The mass of the visible B star is even greater than Cygnus X-1, at around 25 solar masses.
• C)Cygnus X-1's mass is estimated to be about 10 solar masses.
• D)X-rays from Cygnus X-1 vary on time scales as short as a millisecond.
• E)X-ray observations around the object support a temperature of several million K.

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